Tropical cyclone cloud-top height and vertical temperature structure detection using GPS radio occultation measurements

被引：47

作者：

Biondi, Riccardo ^{[1
,2
]}

Ho, Shu-Peng ^{[3
]}

Randel, William ^{[4
]}

Syndergaard, Stig ^{[5
]}

Neubert, Torsten ^{[1
]}

机构：

[1] Natl Space Inst, DTU Space, Copenhagen, Denmark

[2] Abdus Salam Int Ctr Theoret Phys ICTP, Trieste, Italy

[3] UCAR COSMIC, Boulder, CO USA

[4] Natl Ctr Atmospher Res, NCAR, Boulder, CO 80307 USA

[5] Danish Meteorol Inst, Copenhagen, Denmark

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2013年 / 118卷 / 11期

基金：

美国国家科学基金会;

关键词：

tropical cyclone; radio occultation; cloud top; convection; LOWER STRATOSPHERE; DEEP CONVECTION; INTENSITY; ATMOSPHERE; PRESSURE; ALGORITHMS; SPECTRA;

D O I：

10.1002/jgrd.50448

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

The accurate determination of tropical cyclone (TC) cloud-top height and its vertical thermal structure using the GPS radio occultation (RO) technique is demonstrated in this study. Cloud-top heights are determined by using the bending angle anomaly and the temperature anomaly profiles during the TC events, and the results are compared to near-coincident cloud-top heights determined by Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) measurements. Based on 34 closely located RO-CALIOP pairs during 2006 to 2009, TC cloud-top heights from RO are highly correlated with CALIOP (r=0.84), with a mean RO-CALIOP cloud-top height difference of approximately 500 m and a root-mean-square difference near 1 km. GPS RO data also allow analysis of the TC thermal structure, showing warm anomalies in the middle troposphere and cold anomalies in the upper levels, with a strong inversion near cloud top. We further investigate the thermal structure of the TCs from collocated radiosondes, and identify 246 RO-radiosonde pairs from 2001 to 2009. Radiosonde data confirm the thermal structure identified in GPS RO, with a strong inversion near the inferred cloud top. The mean difference between RO-derived inversion heights and those from radiosonde temperature profiles is approximately 500 m. Results show that, while cloud-top height detected from nadir-viewing satellites can be easily biased by a few kilometers, the biases of RO-derived cloud-top height are within similar to 500 m.

引用

页码：5247 / 5259

页数：13

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