scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

More documents

Recommendations

Info

STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Multi-frequency radar studies of PMSE: statistical properties, microphysical results and electron densities Li Qiang , Rapp Markus Leibniz-Institute of Atmospheric Physics at the Rostock University, Kühlungsborn, Germany It is now common belief that polar mesosphere summer echoes (PMSE) originate from turbulence-induced scatter in combination with a large Schmidt number due to the presence of charged ice particles. It provides us opportunity to achieve deep insight of PMSE to apply this theory on simultaneous observations of PMSE at two well separated frequencies. In this study, we first present the statistical properties of PMSE obtained from simultaneous observations with the EISCAT Svalbard radar and the SOUSY Svalbard radar (collocated near Longyearbern (78 o N, 16 o E), with frequencies of 500 and 53.5 MHz, respectively) in June 2006 and also with the EISCAT VHF and UHF radars (collocated near Tromso (69 o N, 19 o E), with frequencies of 224 and 930 MHz, respectively) from the years 2003 through 2007. According to the above mentioned theory, the ratio of the volume reflectivities of PMSE simultaneously observed at two frequencies can be used to calculate the Schmidt number and hence the radii of the charged ice particles involved. The resulting particle radii display excellent agreement with expectations from microphysical models and independent observations of microphysical ice parameters using optical techniques. Finally, we use UHFradar measurements of incoherent scatter in the presence of VHF PMSE to study the electron density dependence of PMSE. Statistical distributions of the ratio |ZA|NA/ne will be presented (where ZA is the average aerosol charge, NA the aerosol number density, and ne the free electron number density) revealing that in the majority of cases |ZA|NA/ne
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The Role of Meteoric Smoke Particles in the Polar Middle Atmosphere Rapp Markus Leibniz-Institute of Atmospheric Physics at the Rostock University, Kühlungsborn, Germany Meteoric smoke particles (MSPs) are thought to be formed as secondary meteoroid ablation products when part of the meteoric material deposited in the altitude range from 70 - 100 km recondenses to form nanometer-scale particles which may then further develop by coagulation and transport. It is current belief that MSPs play an important role in several middle atmosphere phenomena such as the nucleation of mesospheric ice clouds, the metal layers, the transport of meteoric material to the ground, and even the formation of polar stratospheric clouds which in turn play a significant role in the context of ozone destruction during polar spring. While MSPs have long been deemed important for all these processes, solid experimental results on their properties have only recently been acquired with the availability of new rocket-, radar- and satellite-techniques. This paper reviews our current knowledge regarding MSPs taking into account all these new experimental sources as well as recent model results and closes with suggestions for future work.
Page 1 and 2:
SCOSTEP 2010 (STP12) Berlin, 12 - 1
Page 3 and 4:
STP12 Abstracts Berlin, 12 - 16 Jul
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138: STP12 Abstracts Berlin, 12 - 16 Jul
Page 187: STP12 Abstracts Berlin, 12 - 16 Jul
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
show all

scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

Create successful ePaper yourself

Delete template?

Save as template?