气候变化领域集成服务门户(CCPortal): Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation

CCPortal

DOI	10.5194/acp-19-6985-2019
	Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation
	Noersomadi; Tsuda T.; Fujiwara M.
发表日期	2019
ISSN	16807316
起始页码	6985
结束页码	7000
卷号	19 期号:10
英文摘要	Using COSMIC GPS Radio Occultation (RO) observations from January 2007 to December 2016, we retrieved temperature profiles with the height resolution of about 0.1 km in the upper troposphere and lower stratosphere (UTLS). We investigated the distribution of static stability (N2) and the zonal structure of the tropopause inversion layer (TIL) in the tropics, where a large change in the temperature gradient occurs associated with sharp variations in N2. We show the variations in the mean N2 profiles in coordinates relative to the cold-point tropopause (CPT). A very thin (< 1 km) layer is found with average maximum N2 in the range of 11.0-12:0×10-4 s-2. The mean and standard deviation of TIL sharpness, defined as the difference between the maximum N2 (maxN2) and minimum N2 (minN2) within ±1 km of the CPT, is.10:5±3:7/×10-4 s-2. The maxN2 is typically located within 0.5 km above CPT. We focused on the variation in TIL sharpness in two longitude regions, 90-150? E (Maritime Continent; MC) and 170-230? E (Pacific Ocean; PO), with different land-sea distribution. Seasonal variations in TIL sharpness and thickness were related to the deep convective activity represented by low outgoing longwave radiation (OLR) during the Australian and Asian monsoons. The deviation from the mean sharpness (sharpness anomaly) was out of phase with the OLR anomaly in both the MC and PO. The correlation between the sharpness anomaly over the MC and PO and the sea surface temperature (SST) Niño 3.4 index was-0:66 and C0:88, respectively. During La Niña (SST Niño 3.4 <-0:5 K) in the MC and El Niño (SST Niño 3.4 > C0:5 K) in the PO, warmer SSTs in the MC and PO produce more active deep convection that tends to force the air upward to the tropopause layer and increase the temperature gradient there. The intraseasonal variation in sharpness anomaly during slow and fast episodes of the Madden-Julian Oscillation (MJO) demonstrates that eastward propagation of the positive sharpness anomaly is associated with organized deep convection. Deep convection during MJO will tend to decrease N2 below CPT and increase N2 above CPT, thus enlarging the TIL sharpness. Convective activity in the tropics is a major control on variations in tropopause sharpness at intraseasonal to interannual timescales. © 2019 Author(s).
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144381
作者单位	Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, 611-0011, Japan; National Institute of Aeronautics and Space (LAPAN), Bandung, 40173, Indonesia; Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
推荐引用方式 GB/T 7714	Noersomadi,Tsuda T.,Fujiwara M.. Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation[J],2019,19(10).
APA	Noersomadi,Tsuda T.,&Fujiwara M..(2019).Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation.Atmospheric Chemistry and Physics,19(10).
MLA	Noersomadi,et al."Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation".Atmospheric Chemistry and Physics 19.10(2019).