East Asia and Western Pacific METEOROLOGY AND CLIMATE

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169 convergence. Consequently a strong updraft will erect right above this region. From 5krn to 15km height to the front side of updraft, a strong wind component blowing southeastward (northwest wind 16m/sec) was observed, while only about 9m/sec north-west wind at this level was observed on the rear side. Obviously, an outflow region was located above updraft center. The development and maintance of these long-lived convective precipitation systems and its unique structure to interact with its larger scale environment will be pursued in the future. The difference between mid-latitude supercell and this kind of long-lived cell within Mei-Yu frontal zone will be a very interesting research topic. Acknowledgments. We wish to thank Miss Chin-Chin Yeh for her help in the data processing of Doppler radar,CAA(Civil Aeronautics Administration) for kindly supplying of radar data and Micro-Computer center of the Department of Atmospheric Physics, NCU. for the use of computing facilities. This work was supported by the National Science Council under Grant NSC 79- 0202-M008-02. REFERENCES Barnes, S.L., 1973: Mesoscale objective map analysis using weighted time-series observations, NOSS Tech. Memo. ERL NSSL-62, Norman, Oklahoma, 60pp, Brandes, E., 1974: Radar rainfall pattern optimizing technique. NOAA Tech. Memo. ERL NSSL-67, Norman, Oklahoma, 16pp. Browning, K. A., and C. W. Pardoe ,1973: Structure of low-level jet streams ahead of midlatitude cold fronts. Quart. J. Roy. Meteor. Soc., 95, 619-638. Maddox, R. A., C. F. Chappell,and L. R. Hoxit,1979: Synoptic andd meso-a scale aspects of flash flood events. Bull Amer. Meteor. 5oc.,60,115-123. Rinehart R.E., 1979: Internal storm motions from a single non-Doppler weather radar. NCAR Technical Note, NCAR/TN-146+STR. Wang, T-C. Chen, 1988: The radar analysis of two precipitation systems during 1986 Mei-Yu season. Papers Meteor. Res., 11, 63-94. Wang, T-C. Chen, Long-Nan Chang and Pay-Liam Lin, 1988: Rainfall estimate from digital radars in Taiwan area. Tropical Rainfall Measurements. P.471- 482, A. Deepak Publishing.
170 REMOTE SENSING OF ATMOSPHERIC COMPOSITIONS AND OPTICAL CHARACTERISTICS Lin Hai Lu Daren (Institute of Atmospheric Physics, Beijing) Zhou Xiuji (Academy of Meteorological Science, Beijing) ABSTRACT The research results on atmospheric optical characteristics, compositions and visibility with the lidar system and solar spectrophotometer developed in recent years by the Institute of Atmsopheric Physics, Chinese Academy of Science and the Academy of Meteorological Science, State Meteorological Administration are presented in this paper. The results contain retrieval algorithms of active and passive optical remote sensing and field observation of aerosol size distribution, refractive indices, extinction coefficients, meteorological visibility, ozone and water vapor, Especially, we developed simultaneous inversion of aerosol size distribution and complex refractive indices with extinction-forward scattering method, lidar remote sensing of slant visual range at airport, and differential absorption lidar (DIAL) technique of measuring atmospheric composition* Based on lidar and spectrophotometer field observations, this paper also analyses and compares atmospheric optical characteristics in Beijing, Tibetan Plateau and desert area of northwestern China, including termporal and spatial variations of aerosol parameters and thier variation mechanism, and presents validating results of lidar measuring visibility with other mthods. In addition, examples of lidar measuring ozone and water vapor concentrations are given. Finally, the future plan of optical remote sensing of atmospheric trace gases and aerosol particles will be introduced. * Present affiliation: National Nature Science Foundation of China.
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UNIVERSITY OF HONG KOHG LlBEAEY
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International Conference on East As
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FOREWORD The International Conferen
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VHI LIST OF PARTICIPANTS IN THE PHO
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45 LIM, Hock National University of
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XIII INTERNATIONAL ORGANIZING COMMI
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XV! The mean heat sources over Asia
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XVIII , Jhe impact of urbanization
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XX The East Asia heavy rainfall num
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THE THERMAL STRUCTURE AND CONVECTIV
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THE COUPLING OF UPPER-LEVEL AND LOW
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Q \ ed atmospheric processes * 2. M
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2) DH Experiment The horizontal flo
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of the orography, establishing a na
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11 a o 12 21 36 4$ 60 fZ Pig.3. Nea
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14 OVERVIB/V CF MEI-YU RESEARCH IN
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16 Fig.l Climatological daily rainf
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18 showed a marked contrast between
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20 3. SWDPTiC ^mLYSIS WD DIA^DSTIC
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22 and Chang (27). It was also foun
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24 triggering mechanisms. In additi
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26 important mechanism for creating
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28 mature convections. Satellite pi
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30 States included 70 scientists an
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1-4 M-H C CO *+-« C CD 4-9 C o •
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34 19.Chen, G.T. J., "A study on sy
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36 complexes: 27-28 May 1981 case",
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38 On Temporal Variations of Low Le
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40 low-level flows of the Asian sum
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42 the northern part of the Pacific
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44 cycle is observed for the amplit
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46 SUMMER (6-85 : 12 2 M979 P:850 M
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Observed Structure and Propagation
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50 southeasterly current in the wes
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40°N 30°N 15°N Equator 90°E 105
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54 The pattern of arrows in Fig. 3
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56 Figure 5. Vertical cross-section
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58 TOE MEAN HEAT SOURCES OVER ASIAN
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60 over tost parts of India, Southe
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62 inctly different types. One is t
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64 60 70 too no 120 00
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Fig.2.The 7-month mean values of (a
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68 A NUMERICAL SIMULATION OF THE ME
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70 Synoptic circulation patterns fo
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72 (iii) The mid-latitude westerlie
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74 and the temperate latitude weste
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76 O 1 - (b) Total I Rainf a" 4 0
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78 LONGITUDE TIME WINOCROS5 SECTION
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A simulation of Lee-Cyclogenesis ov
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82 implemented to the global model
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84 In all three experiments, a deep
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86 References: Ballish, A.B., 1980:
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93 1.2-a I2.S 120. 127,5 US. 11.5 7
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95 2. Climatology of East Asian mon
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97 850 MB WIND (U*. V) S. 0 30N i~^
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99 120 ISO ISO 210 2VJ 770 ISO 180
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Figure 6 (a) Time-longitude section
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103 Monsoon cyclones /-~N I Subtrop
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105 INFLUENCE OF VARIATIONS OF THE
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surface during the rainy period of
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located at the position of the firs
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egion of western Australia. These t
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115 Fig.^57 Characteristics of vari
Page 142 and 143: 119 Some Dynamic Aspects of the Equ
Page 144 and 145: 121 equatorial zonal plane. In this
Page 146 and 147: 123 where N is nondimensional Newto
Page 148 and 149: 125 moisture concentration graduall
Page 150 and 151: 127 boundary layer frictional conve
Page 152 and 153: 129 000 - 20 30 WAVELENGTH (10 3 KM
Page 154 and 155: 131 CHINESE POLAR ORBITING METEOROL
Page 156 and 157: some middle and small receiving sta
Page 158: 135 local meteorology units through
Page 163 and 164: 140 The Mesoscale Monitoring System
Page 165 and 166: 142 The weather radar network is co
Page 167 and 168: 144 where V and L are in centimeter
Page 169 and 170: 146 PRF: 80-2000 Hz Minimum detecta
Page 171 and 172: 148 [UHF Doppler RadaT] ^Pibalk ' Z
Page 173 and 174: 150 STRUCTURAL FEATURES OF A SQUALL
Page 175 and 176: 152 25 2200L 16 MAY 0000 L 17 MAY X
Page 177 and 178: 154 0*73 KN 0,73 KM TAMEX IOF2 00*1
Page 179 and 180: 156 4.2 East-west Cross Section The
Page 181 and 182: 158 KM -20 EAST OF TOGA -10 0043 28
Page 183 and 184: 160 Radar Observation of Precipitat
Page 185 and 186: 162 Fig. 2. A triple doppler networ
Page 187 and 188: 164 for this presentation Fig. 5a(0
Page 189 and 190: 166 near the northern tip of Taiwan
Page 191: 168 In order to understand the inte
Page 195 and 196: 172 In the meantime, with the incre
Page 197 and 198: 174 method (scanning frequency) and
Page 199 and 200: 176 For sharp absorption lines, the
Page 201 and 202: 178 [10]* Sun Jinhui, Qiu Jinhuan e
Page 203 and 204: 180 COMPARISION OF RADAR ESTIMATES
Page 205 and 206: 182 of 29 %). The Ra/Rg and the rel
Page 207 and 208: 184 under 1) errors in estimating r
Page 209 and 210: 186 Table 1. Summary of Ra/Rg for t
Page 211 and 212: 188 FIGURE 3. CORRELATION COEFFICIE
Page 213 and 214: 190 DOPPLER WEATHER RADAR OBSERVATI
Page 215 and 216: 192 which are concerned about by th
Page 217 and 218: 194 fly on schedule, take off and l
Page 219 and 220: 196 and minus value. Fig. 4 is the
Page 221 and 222: 198 REFERENCES 1. Donald Turnbull e
Page 223 and 224: 200 evaporation, condensation, wind
Page 225 and 226: 202 control valve which permits amp
Page 227 and 228: 204 Table 1 Rainfall Records of a T
Page 229 and 230: 206 various rainfall intensity shou
Page 231 and 232: 208 c 400-- £ o "5 350 H — A —
Page 233 and 234: 210 IMPACT OF HOURLY S-VISSR SATELL
Page 235 and 236: 212 Fig. 1. Daily 1.200 UTC • 500
Page 237 and 238: I Fig. 2. GMS-3 IR picture taken at
Page 239 and 240: 216 110E 20 115E 30. 20" X J 4o*N'\
Page 241 and 242: 218 Fig. 7. Provisional best track
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220 PREDICTABILITY OF LOW FREQUENCY
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222 expressions that invoke the Mon
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224 b) A low frequency mode experim
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226 A CLOUD WAVE THEORY AND ITS APP
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228 heating indicating a substantia
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230 If N Fig. I, A schematic diagra
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232 2. A Quasi-Diabatic Geostrophic
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234 X can be q, £ c, v, or T. The
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236 On the basis of the preceding d
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238 west of the maximum cloud cover
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240 NORMAL MODES OF CLIMATOLOGICAL
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242 (1983) pointed out that simulat
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244 reach the top of model atmosphe
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246 is not clear in the tropics. Th
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248 Wang, J.-T., J.-W. Kim and W.L.
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250 (a) 30°N-30°S (January) (b) 3
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252 An Important element of the ear
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254 IOCS I02S 3SN Fig. 1 A general
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256 staion of LID (farmland in the
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258 start from October 1990 and end
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260 The measurements of surface rad
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262 Secular trends in urban tempera
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264 LONGTERM TEMPERATURE TRENDS AT
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266 Using these data sources It has
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268 (3) a nearly static phase where
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270 greater rate of increasing mini
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272 consistent with accepted theory
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274 RECENT APPLICATIONS OF THE PENN
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276 upward motion (Fig. Ib) of air
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278 Stauffer and Warner (1987) used
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280 observed precipitation rates fo
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282 coupled model system show that
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284 Baroclinic Instability of Modif
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286 Eq (2.4) corresponds to the con
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288 conventional Eady waves, except
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290 perturbations in Mode I remains
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292 5: Summary And Remarks Two diff
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294 INFLUENCES OF OROGRAPHY ON FLOW
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296 (13) The next step is to determ
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298 where „ = 1 - R a = - R 2>x c
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300 — -~ 1, thus the above relati
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302 The vertical velocity at the to
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304 THE MIGEOPHYSICS OF A MEI-YU CA
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306 O.Qg-m" 3 , which is probably d
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308 snowflakes aggregation generate
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310 (a) TRP.CK - 2 (1652 0 - 1711 0
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312 1987 6/16 17QSSO U 0.9 C 2 = 1.
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314 2. Heavy Rainfall Upstream of a
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316 accumulated rainfall amount on
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318 Figures 11 and 12 demonstrate t
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320 DEGREE K IT ( M/S ) QC (G/KG) -
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322 270 290 310 330 350 370 POTJEMP
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324 A primitive equation model was
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326 had already been affected by so
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328 I .011 I 1...J/1 l\l l-L-l L I
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330 «'.. Fig. 11 Same as Fig. 9 ex
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332 Mathiar, M. B., 1983: A quasi-L
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334 Long (1985), the maximum occure
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336 February 1979. It clearly indic
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338 Jiang H. M. and Jeng H. N., "Nu
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TEMP.GRAD.(C/100KM3 1979/2/04/OOZ 1
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TKANS.C1R. 9 1979/2/04/OE2 •; J97
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344 however, the sharp decrease in
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346 00 " XD 3 b D 3 aD b dD = [ N.
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348 heights. The median diameter an
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350 going on within the melting lay
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352 TRFICK - I (HIS 0 - H31 0J PR0B
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354 MONTHLY AND SEASONAL FORECASTS
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356 In another experiment, the heat
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358 4. CONCLUSION The forecasting e
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360 TABLE 1. COMPARISONS OF THE COR
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362 Fig. 3. Map of the correlation
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364 THE TELECONNECTION OF EQUATORIA
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366 3-*-j-] dag grid % ^Showing eve
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368 oBE (6) fl(uP) , fl(vP) ... 0(w
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370 the major tidal components over
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372 one meter. Most of the water le
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374 and Technology Advisory Group,
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376 INTRODUCTION In 1%6, Bjerknes,
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378 THE INTERANNUAL VARIABILITIES O
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380 current between 127° E—128°
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382 El Nino and Southern Oscillatio
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384 Fig.5. The ADCP measurements (s
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386 I. Introduction Climate is one
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388 specifically at the modeling an
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390 Even during the warm phase of t
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392 (iv) To investigate the morphol
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394 Change program under IGBP is a
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396 TABLE 1: PROCESSES TO BE STUDIE
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398 w / / / / / / / / /-"V / / Z Fi
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400 CHINA-JAPAN JOINT RESEARCH PROG
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402 eastward. In addition to mainta
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404 Processes of Hicroscale Air-Sea
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406 phase velocity; both ratios, th
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T i l l ! o I • GO 00 J Wind Velo
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410 Concluding Remarks In order to
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412 THE VARIATIONS OF THE SST IN TH
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414 maps, there is an extensive are
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416 Flg.1. Time series of the annua
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418 90 N 90 S|. . . 20E 20E Fig.3c.
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420 ON LABORATORY SIMULATION OF SEA
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422 EXPERIMENT: Only simple and eas
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424 With the ability to simulate co
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426 (5) Meroney, R.N., Cermak, J.E.
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428 Fig. 3 Composite Photograph of
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430 A detailed description of the m
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432 However, the schemes failed to
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434 REFERENCES Anderson, E. and A.
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436 Figure 2 Vertical structure of
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438 36 HOUR FORECAST MEAN SEA LEVEL
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440 al.,1984). In this paper, a gen
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442 where subscript x denotes u, v,
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444 AM AM PO- N3 A/i + N3' and NH--
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446 there is only a minor differenc
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448 Guo X.R.,Yan Z.H.,Zhang Y.L. an
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450 THE EAST ASIA HEAVY RAINFALL NU
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452 (described in section 2) carrie
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454 Fig. . 2. Validation of Tempera
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456 simulate the partly cloudy cond
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458 3.3 Nesting Run with 2 km Grids
Page 483 and 484:
460 REFERENCES Bhumralker, C. M., 1
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462 The Impact of the Termination o
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464 and 45.8 km respectively, which
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466 relative to (P+O/2, they actual
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468 Chang, S. W., 1982: The ore-gra
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470 Table 3. 24-hour forecast error
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472 Initial Position Errors 1983-19
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474 A SPECTRAL MODEL FOR MEDIUM RAN
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476 where I p u = FC-
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478 given. This is treated separate
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480 predicted location is too far t
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482 Fig.2 Distribution of 24h preci
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484 LONG-RANGE FORECASTING OF TAIWA
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486 monsoon in east Asia and for co
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488 unfortunately are not integral
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Figure 1. SPECTRAL ANALYSIS FOR MAY
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492 TaUj.g_ji Multiple rnfjross i o
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494 THE NONLINEAR INTERACTION OF IN
Page 519 and 520:
496 Burgers(l948) had put forward a
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498 From Eqs,(8), the necessary con
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500 In order to show quantitatively
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502 Multiple Equilibria Of a Therma
Page 527 and 528:
504 For the two-level quasi-geostro
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506 The coefficients Z, T, H, and T
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508 just the stable Branch 7 for st
Page 533 and 534:
510 REFERENCES Bolin, B., 1950: On
Page 535 and 536:
512 STATIONARY SOLUTIONS WITH TOPOG
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514 ANNTTAL CYCLE OF 2TTT Fig. 7 An
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516 CISK modes have narrow axes of
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518 about one to three weeks. Predi
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520 first one. In his work, the lon
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522 The works mentioned are qualita
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524 [12] Wang, S.-W., Adv. in Atmos
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526 processes that give rise to a d
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528 3 Local energetics analysis The
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530 dominant waves of a local mode
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532 slightly longer than the length
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534 tends to induce a westerly jet
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536 TYPHOON FORMATION AND DEVELOPME
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538 influence of the mean wind prof
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540 3. Steady-State Solutions The p
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542 of maximum wind (Fig 7 c). This
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544 (A) b- l.O.(B) b- 0.8.(C) b- 0.
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546 b= 1.0,C= 0.03,0 = 120., T = 50
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548 tropical cyclones. Then, Shapir
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550 fine equation (2) will be used
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552 4) Cumulus vertical flux of hea
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554 Fig. 4 Same as Fig, 1, but for
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556 n=800 bPa and r **1. Now it is
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558 RRFKRRNCF Challa, M., and R. T,
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560 The limited-area forecast syste
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562 Our study is to obtain and anal
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564 coarse grid (Fig. 5). The struc
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566 ACCUMULATED PRECIPITATION Fig.
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569 AUTHOR INDEX ANTHES, Richard A.
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571 LIOU, Chi-Sann LIU, Cho-Teng LI
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