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- 2018
利用COSMIC掩星折射指数分析全球大气边界层顶结构变化
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Abstract:
基于小波协方差变换法，由折射指数廓线确定大气边界层顶高度，利用2007至2012年气候星座观测系统（Constellation Observing System for Meteorology Ionosphere and Climate，COSMIC）掩星折射指数廓线分析全球大气边界层顶参数随地理位置、季节和日变化的特征，结果表明全球大气边界层顶结构受热力因素和大气动力因素的影响，具有明显随经纬度变化的特征。在大气动力因素主要影响下，30°S～30°N范围内陆域比海域的季节变化幅度更强。对全球大气边界层顶高度月均值和去季节性变化距平值的分析表明2008年和2011年大气边界层顶高度出现季节性异常。大气边界层顶气压与高度在全球呈负相关，而温度与高度在南北纬40°～90°呈正相关，30°S～30°N呈负相关。2012年全球大气边界层顶高度日变化幅度均值为0.37 km，同纬度海洋与陆地区域年平均边界层顶高度的日变化有一定相关性
| [1] | Kursinski E R, Hajj G A, Schofield J T, et al. Observing Earth's Atmosphere with Radio Occultation Measurements Using the Global Positioning System[J]. <em>Journal of Geophysical Research Atmospheres</em>, 1997, 102(D19):23429-23465 |
| [2] | Russell P B, Uthe E E, Ludwig F L, et al. A Comparison of Atmospheric Structure as Observed with Monostatic Acoustic Sounder and Lidar Techniques[J]. <em>Journal of Geophysical Research Atmospheres</em>, 1974, 79(36):5555-5566 |
| [3] | Basha G, Ratnam M V. Identification of Atmospheric Boundary Layer Height over a Tropical Station Using High-Resolution Radiosonde Refractivity Profiles:Comparison with GPS Radio Occultation Measurements[J]. <em>Journal of Geophysical Research Atmospheres</em>, 2009, 114(11):713-721 |
| [4] | Kumar K K, Jain A R. L Band Wind Profiler Observations of Convective Boundary Layer over Gadanki, India (13.5_N, 79.2_E)[J]. <em>Radio Science</em>, 2006, 41(2):1-12 |
| [5] | Ratnam M V, Basha S G. A Robust Method to Determine Global Distribution of Atmospheric Boundary Layer Top from COSMIC GPS RO Measurements[J]. <em>Atmospheric Science Letters</em>, 2010, 11(3):216-222 |
| [6] | Ao C O, Waliser D E, Chan S K, et al. Planetary Boundary Layer Heights from GPS Radio Occultation Refractivity and Humidity Profiles[J]. <em>Journal of Geophysical Research Atmospheres</em>, 2012, 117(D16):16117 |
| [7] | Chan K M, Wood R. The Seasonal Cycle of Planetary Boundary Layer Depth Determined Using COSMIC Radio Occultation Data[J]. <em>Journal of Geophysical Research Atmospheres</em>, 2013, 118(22):12422-12434 |
| [8] | Beyrich F. Mixing Height Estimation from Sodar Data-A Critical Discussion[J]. <em>Atmospheric Environment</em>, 1997, 31(23):3941-3954 |
