Study of transport and photochemistry around the tropical tropopause using Chemistry Climate Models

使用化学气候模型研究热带对流层顶周围的传输和光化学

• 批准号: 19740283
• 负责人: FUJIWARA Masatomo
• 金额: $ 2.36万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19740283/
• 关键词: 熱帯; 対流圏界面; 輸送; 光化学; 数値モデル

There exists significant sub-seasonal variability in temperature and other parameters around the tropical troomuse. This is due to equatorial waves, intra-seasonal oscillations (ISOs), and other disturbances that are generated by tropical organized convection. Therefore, appropriate representation of tropical convection and tropical disturbances is crucial even for the Chemistry Climate Models (CCMs) that simulate and project stratospheric ozone, since these waves significantly influence the stratosphere-troposphere transport processes and help determine the coldest temperatures, affecting the dehydration processes in the tropical tropopause region. In this study, the wave activity in temperature and zonal and meridional winds at 100hPa in the tropics is analyzed for four CCMs that produced high time frequency winds and temperatures (CCSRNIES, CMAM, MRI, and WACCM) and for five reanalysis data sets (ERA40, ERA-Interim, JRA25, NCEP/NCAR (NCEP1), and NCEP-DEO AMIP-II (NCEP2)), using a zo … More nal-wavenumber-frequency spectral analysis method with a equatorially symmetric-antisymmetric decomposition.Features commonly observed in all data sets are equatorial Kelvin waves and mixed RossbY gravity OMRG) waves. ISOs, at frequencies smaller than O. 05 cycle per day, are mostly not statistically significant with respect to the background spectra estimated here; however, largest power is found in these regions. The activity for equatorial Kelvin waves, MRG waves, and symmetric eastward-moving ISO is defined as the integration of power spectral density in the respective zonal-wavenumber-frequency region for each wave/disturbance. The statistical significance is considered only for Kelvin and MRG waves. The ISO activity here is the upper limit. Results indicate that five reanalysis data sets have very different wave activities. The Kelvin and MRG wave activities in ERAs are 2-3 times greater than those in NCEPs; those in JRA25 are close to the average. The ISO activity (the upper limit) is rather similar for the five reanalysis data sets. The wave activities in the four CCMs are generally within the range of those in the reanalysis data. WACCM shows the greatest Kelvin and MRG wave activities, which are comparable to those in ERAs. CCSRNIES shows the smallest Kelvin wave activity, and MRI shows the smallest MRG activity. The ISO activity (the upper limit) in the CCMs is greater than that in the five reanalysis data sets except for CCSRNIES.The above results indicate that the reanalysis data currently available do not give the actual wave activities due to their large discrepancy. Analysis of radiosonde data and GPS occultation temperature data is necessary to investigate the actual wave activities. Less

在热带风场附近，温度和其他参数存在着显著的亚季节变化。这是由于赤道波、季节内振荡（ISO）和其他由热带有组织对流产生的扰动。因此，热带对流和热带扰动的适当表示甚至对于模拟和预测平流层臭氧的化学气候模式（CCM）也是至关重要的，因为这些波显著影响平流层-对流层传输过程，并有助于确定最冷温度，从而影响热带对流层顶区域的脱水过程。本文利用一个高时频风场和温度场资料，分析了四个产生高时频风场和温度场的CCM（CCSRNIES、CMAM、MRI和WACCM）和五个再分析资料（ERA40、ERA-Interim、JRA25、NCEP/NCAR（NCEP 1）和NCEP-DEO AMIP-II（NCEP 2））在热带100 hPa上的温度波和纬向风场的活动。 ...更多信息 在所有数据集中通常观测到的特征是赤道Kelvin波和混合RossbY重力（OMRG）波。ISO，频率小于O。05个周期/天，相对于这里估计的背景光谱，大多数情况下在统计上不显著;然而，在这些区域中发现最大功率。赤道开尔文波，MRG波，和对称东移ISO的活动被定义为在各自的带状波数频率区域的每个波/扰动的功率谱密度的积分。仅考虑Kelvin波和MRG波的统计显著性。这里的ISO活动是上限。结果表明，五个再分析数据集有很大的不同波活动。ERAs的Kelvin波和MRG波活动比NCEP的大2 - 3倍，JRA25的Kelvin波和MRG波活动接近平均值。五个再分析数据集的ISO活度（上限）相当相似。四个CCM中的波动活动一般在再分析资料的波动范围内。WACCM显示了最大的Kelvin波和MRG波活动，这与ERA中的那些相当。CCSRNIES显示最小的开尔文波活动，MRI显示最小的MRG活动。除了CCSRNIES外，其他5个再分析资料的ISO活动性（上限）均大于CCM，说明现有再分析资料与实际波动活动的差异较大，不能反映实际波动活动。分析无线电探空资料和GPS掩星温度资料是研究实际波浪活动的必要条件。少

项目成果

Multi-model assessment of the upper troposphere and lower stratosphere: Tropics and trends, Journal of Geophysical Research, submitted

对流层上层和平流层下层的多模型评估：热带和趋势，地球物理研究杂志，已提交

• 发表时间: 2009
• 作者: Gettekman;A.;M. I. Hegglin;S-W. Son;J. Kim;M. Fujiwara;T. Birner;S. Kremser;M. Rex;J. A. Anel;J. Austin;J. F. Lamarque;H. Akiyoshi;D. Plummer;T. G. Shepherd;J. Scinocca;M. Michou;H. Teyssedre;M. Dameris;H. Garny;C. Bruhl;P. Jockel. S.
• 通讯作者: P. Jockel. S.

Seasonal to long-term variations of water vapor in the tropical lower stratosphere observed with balloon-borne hygrometers

用气球湿度计观测到的热带低平流层水汽的季节性到长期变化

• 发表时间: 2009
• 作者: Fujiwara;M.;F.Hasebe;M.Shiotani;H.Voemel;S.-Y.Ogino;S.Iwasaki;N.Nishi;T.Shibata;J.Valverde-Canossa;H.B.Selkirk;S.J.Oltmans
• 通讯作者: S.J.Oltmans

Correction for radiation dry bias found in RS92 radiosonde data during the MISMO field experiment, Scientific Online Letters on the Atmosphere

MISMO 现场实验期间 RS92 无线电探空仪数据中发现的辐射干偏差的校正，大气科学在线快报

• 发表时间: 2008
• 期刊: 4
• 作者: Yoneyama;K.;M. Fuj i ta;N. Sato;M. Fuj iwara;Y. Inai;F. Hasebe
• 通讯作者: F. Hasebe

Correction of Radiosonde Pressure and Temperature Measurements Using Simultaneous GPS Height Data

使用同步 GPS 高度数据校正无线电探空仪压力和温度测量值

• DOI: 10.2151/sola.2009-028
• 发表时间: 2009
• 期刊: SOLA
• 影响因子: 1.9
• 作者: Inai;Y.;F. Hasebe;K. Shimizu;and M.Fujiwara
• 通讯作者: and M.Fujiwara

Seasonal to long-term variations of water vapor in the tropical lower stratosphere observed with balloon傭orne hygrometers

用气球湿度计观测到的热带低平流层水汽的季节性到长期变化

• 发表时间: 2009
• 作者: M. Fujiwara;他11名
• 通讯作者: 他11名