AIDJEX Bulletin #40 - Polar Science Center - University of Washington

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TABLE 1 COMPARISON OF ESTIMATED ERRORS, AIDJEX AND NWS 24-hr 36-hr 48-hr AIDJEX NWS Prog. Prog. Prog. RMS error (mb) 0.6 3.5 3.3 4.7 6.4 Mean error (mb) 0.4 2.5 2.8 3.9 5.0 Vector error in G 10% 50% 50%* - 75%" (*> From Walsh (1977). REFERENCES Coon, M. D., G. A. Maykut, R. S. Pritchard, D. A. Rothrock, and A. S. Thomdike. 1974. Modeling the pack ice as an elastic-plastic material. AIDJEX BuZZetin, 24, 1-106. Coon, M. D., R. T. Hall, and R. S. Pritchard. 1977. Predictions of arctic ice conditions for operations. In Proceedings Ninth Offshore TechnoZogy Conference, vol. 4, pp. 307-314, Houston, Texas. Hibler, W. D. 111, and W. B. Tucker 111. 1977. Modeling pack ice as a viscous continuum: an examination of the circulation of the arctic ice cover over a two-year period. Unpublished manuscript, CRREL, Hanover, NH. McPhee, M. G. 1977. An analysis of pack ice drift in summer. Paper presented at Symposium on Sea Ice Processes and Models, 6-9 September, University of Washington, Seattle. Proceedings to be published by UW Press. Pritchard, R. S. 1977. The effect of strength on simulations of sea ice dynamics. In Proceedings Fowth IntemationaZ Conference on Port and Ocean Engineering Under Arctic Conditions, pp. 494-505, Memorial University of Newfoundland, St. Johns. Pritchard, R. S., and M. D. Coon. 1977. A research plan to test the AIDJEX model as an ice forecasting aid. Annual Report to Environmental Research Laboratories, NOAA, contract no. 03-6-022-35330. Pritchard, R. S., and R. T. Schwaegler. 1975. Applications of the AIDJEX ice model. In proceedings Third InternationaZ Conference on Port and Ocean Engineering Under Arctic Conditions, vol. 1, pp. 513-526, University of Alaska, Fairbanks. Pritchard, R. S., and D. R. Thomas, 1978. Response of sea ice to one-dimensional driving forces. AIDJEX BuZZetin, 38, 53-94. Pritchard, R. S., M. G. McPhee, M. D. Coon, and E. Leavitt. 1977. Winter ice dynamics in the nearshore Beaufort Sea. AIDJEX BuZZetin, 37, 37-93. Walsh, J. E. 1977. Ice forecasting limitations imposed by the accuracy of atmospheric prediction models. AIDJEX BuZZetin, 36, 1-12. Wittmann, W. I., and M. D. Burkhart. 1973. Sea ice. Mariners Weather Log, part 1, vol. 17(3), pp. 125-134; also part 2, vol. 17(6), pp. 343-355, and part 3 (1974), vol. 18(4) , pp. 219-229. 16 9
a) Base line b) 24-hour prediction c) 36-hour prediction d) 48-hour predi cti on Figure 1 . Air stress field at 12 GMT on 27 January. (a) are daily averages. Scale vector is 4 dyn cm-l. The base line vectors 170
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DATA BUOYS AIDJEX BULLETIN No. 40 J
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NOTE TO FRIENDS, AND BYSTANDERS . .
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SUMMARY OF TECHNICAL DEVELOPMENTS I
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milestones, kept the vendor working
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The scene during deployment of HF-N
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The initial AIDJEX scientific plan
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poizr-orbiting satellite, which is
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t@ the spacecraft during each orbit
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BUOY NAHE COMMUN. COMMANDS FIXES TA
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L( 0 I 2 3 4 3 Radial error, kilome
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The buoy will be subjected to tempe
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nics occupy about 12 feet of the 17
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Ill -- - KEY AIUJEX WIN WW AEBa 0 4
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event that a melt pond should form
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chute supplied by Paranetics Inc. i
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6'" IqORGANIC LITHIUM BP.TTEI?Y IMP
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OM (AD RAMS) UREMEN~ \ AIRDROP N m
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provides a grid from which geostrop
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words; a four-bit air temperature w
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PERFORMANCE OF MET/OCEAN BUOYS IN A
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Sensor samples were taken every thr
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strengths are known, were used with
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the ice (causing reduced shear). An
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(McPhee, Mangum, and Martin) , TABL
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70°N 75'N n 3 P 17OOW (D Y 170°W
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12OOW * U Station 25. Xeasurements
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(McPhee , Mangum, and Martin) 2701
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(McPhee, Mangum, and Martin) a 0 a
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"i BUOY 4 I 43 360- 309- 257 206 15
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a30gl 251 I 60 511 r 43 BUOY 4 I
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n 4, (McPhee, Mangum, and Martin) 8
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(McPhee, Mangum, and Martin) 33 W c
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. '-,..I.. . B A R R O W W I N D S
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:
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I 25 23 t h--:!li[ NCI PiHCEl4l 22
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.5 .4 .3 0 A R 2 R 0 W J - 0 B U -
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9 1.5 1.0 c 8 w .5 R 930 $ 565 1000
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Clock corrections were applied rout
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Q) u o z z i 4- 4- Z + + z f n 9 Ef
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TABLE 1 DIFFERENCES IN DAILY TEMPER
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Laboratory calibration of the ADRAM
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3.20- - 1 t W o? 2 3.051 ...:-.;..
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POSITION MEASUREMENTS OF AIDJEX MAN
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some redundancy. Four points were u
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75.5 75.: - E75.1 LLI % y75.c - 1 1
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The translocation principle removes
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POSITION ACCURACY To evaluate the q
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TABLE 1 STAND-ALONE ACCURACY 68th P
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Az i mu t h s When both receivers a
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DATA PROCESSING Following the field
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model ice motion in the statistical
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FREC 1 INCY / DOPPLER / FREQUENCY /
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35 30 25 v) > 0 2 20 LL 0 r= E m 15
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An example of a large-scale buoy ar
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observations are needed in remote a
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useful for determining how various
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as well as velocity fields, we must
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Since small changes in the yield su
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The transformation of the system of
Page 120 and 121: e able to judge how well such a mod
Page 122 and 123: then the flow rule becomes Q = +A -
Page 124 and 125: [-B' -F Finally, we eliminate Carte
Page 126 and 127: differential equation. 2. Discontin
Page 128 and 129: Substituting (36) and (37) into (34
Page 130 and 131: arbitrarily assign the values of 1
Page 132 and 133: The special case when advection can
Page 134 and 135: TABLE 1 STRETCHING, STRESS, ASP CHA
Page 136 and 137: ate of deformation, we have normali
Page 138 and 139: CHARACTERISTIC EQUATIONS The ordina
Page 140 and 141: One way to circumvent the problems
Page 142 and 143: The equations governing solutions a
Page 144 and 145: It is readily seen that when body f
Page 146 and 147: which may be substituted into equat
Page 148 and 149: a the stress derivative dCldS remai
Page 150 and 151: Although we have not studied in thi
Page 152 and 153: Courant, R., and D. Hilbert. 1962.
Page 154 and 155: A RESEARCH PLAN TO TEST THE AIDJEX
Page 156 and 157: the barges managed to reach their d
Page 158 and 159: APPROACH A baseline simulation 0-f
Page 160 and 161: SENSITIVITY OF ICE RESPONSE TO DIFF
Page 162 and 163: Since free drift of ice is computed
Page 164 and 165: and what is observed becomes less i
Page 166 and 167: stresses appear to be relatively un
Page 168 and 169: ehavior is directly related to accu
Page 172 and 173: a) Base line b) 24-hour prediction
Page 174 and 175: \ / a) Base line b) 24- hour predi
Page 176 and 177: a) Base line b) 24- hour predi ct i
Page 180 and 181: \ / a) Base line b) 24-hour predict
Page 182 and 183: .. a) Base line b) 24- hour predict
Page 184 and 185: J2 a) Base line b) 24-hour predicti
Page 186 and 187: ) 24-hour prediction c) 36-hour pre
Page 190 and 191: 8 Figure 17. AIDJEX surface pressur
Page 192 and 193: APPENDIX 1 AIDJEX DATA FILES 1. Pos
Page 194 and 195: 9A. Surface-1 eve1 ai r pressure (d
Page 196 and 197: 19. Surface pressure (Val i dated)
Page 198 and 199: APPENDIX 2 AIDJEX DATA TRANSFERRED
Page 200 and 201: I -7-71327GEO A Cards (continued) 7
Page 202: B Cards (continued) 201
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AIDJEX Bulletin #40 - Polar Science Center - University of Washington

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