Climatological characteristics of the tropopause parameters derived from GPS/CHAMP and GPS/SAC‐C measurements
Climatological characteristics of the tropopause parameters derived from GPS/CHAMP and GPS/SAC‐C measurements
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DOI：
10.1029/2005jd006827
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发表时间：
2006-10
影响因子：
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通讯作者：
P. Kishore;S. Namboothiri;K. Igarashi;J. Jiang;C. Ao;L. Romans
中科院分区：
文献类型：
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作者：
P. Kishore;S. Namboothiri;K. Igarashi;J. Jiang;C. Ao;L. Romans
[1]利用CHAMP和SAC-C卫星GPS掩星观测资料，对对流层顶参数进行了分析。在本研究中，我们考虑了3-4年的数据。对流层顶参数，如温度，高度，压力和位温已分别研究了热带和其他地区。将CHAMP和SAC-C卫星的温度廓线（在赤道附近获得）与无线电探空仪的测量结果进行比较，表明在对流层顶以下高度的温度廓线非常吻合。在对流层顶水平以上可以看到1-2 K的偏差。对热带地区（20°S-20°N）对流层顶参数的分析表明，这些参数存在年际变化。对流层顶温度和气压的变化有很强的相关性，它们都与对流层顶高度相关。对流层顶参数的变化存在明显的年振荡。采样数据显示出一定的年际变化。我们发现冷点对流层顶（CPT）和直减率对流层顶（LRT）的估计方法之间存在一些差异。对流层顶的全球结构表明热带和高纬度地区之间存在明显的差异。参数的季节性变化很明显;然而，它们在极地地区更为突出。本文证实，CHAMP和SAC-C测量对流层顶参数是互补的，因为这两个测量之间的差异很小。
[1] We have analyzed the tropopause parameters using the data retrieved from the GPS occultation experiment on board the CHAMP and SAC-C satellites. In the present study we have considered 3–4 years of data. Tropopause parameters such as temperature, height, pressure, and potential temperature have been separately studied for the tropical and other regions. Comparison of the temperature profiles (obtained near the equator) by the CHAMP and SAC-C satellites with the radiosonde measurements indicates very good agreement at altitudes below the tropopause. Deviations of 1–2 K are seen above the tropopause level. Analysis of the tropopause parameters separately done for the tropics (20°S–20°N) indicates annual variations. The tropopause temperature and pressure variations are strongly correlated, and they both anticorrelate with the tropopause height. Annual oscillation is evident in the variations of tropopause parameters. The sampled data indicate some interannual variations. We have found that there are some differences between the cold point tropopause (CPT) and lapse rate tropopause (LRT) methods of estimates. The global structure of the tropopause indicates clear differences between the tropics and high-latitude regions. Seasonal variation is evident in the parameters; however, they are more prominent in the polar regions. The paper confirms that the CHAMP and SAC-C measurements of the tropopause parameters are complementary as there is very little difference between the two measurements.