气候变化领域集成服务门户(CCPortal): The Madden-Julian Oscillation in an Aquaplanet-Like General Circulation Model With and Without Continents

CCPortal

DOI	10.1029/2018MS001455
	The Madden-Julian Oscillation in an Aquaplanet-Like General Circulation Model With and Without Continents
	Das S.; Sengupta D.; Chakraborty A.
发表日期	2019
ISSN	19422466
起始页码	1459
结束页码	1476
卷号	11 期号:5
英文摘要	We have conducted experiments with the Community Atmospheric Model version 5.1 configured as an aquaplanet, with the sun at March equinox, in order to study how the model Madden-Julian oscillation (MJO) responds to (i) the introduction of continents and (ii) realistic sea surface temperature (SST) distribution. Model results are compared with ERA-Interim reanalysis and analyzed in terms of the moist static energy (MSE) budget to study the growth and propagation of MJO. With idealized zonally symmetric SST, the aquaplanet model produces a double Intertropical Convergence Zone (ITCZ) and an MJO-like mode with variance at intraseasonal (30- to 96-day) periods and zonal wave number 1. When we introduce continents with realistic orography and interactive surface temperature, soil moisture, and albedo, the variance of MJO is mainly confined to zonal wave numbers 1 and 2 but reduced by a factor of 3 due to weaker boundary layer moisture convergence. With prescribed climatological January SST boundary condition (which includes Indo-west Pacific warm pool) in the presence of continents, model MJO variance is enhanced and distributed across zonal wave numbers 1 to 5, in closer agreement with observation. Thus, the presence of land by itself is not enough, but realistic SST distribution is necessary for improved space-time characteristics of model MJO. Both in simulations and ERA-Interim data, meridional and vertical advection of MSE promotes eastward movement of MJO. In the model experiments, meridional advection of low-level MSE anomaly is most significant in the vicinity of the ITCZ, indicating the importance of processes that determine the location of (single or double) ITCZ. ©2019. The Authors.
英文关键词	aquaplanet with continents; CAM; ITCZ; Madden Julian oscillation (MJO)); moist static energy budgets; zonally symmetric SST
语种	英语
scopus关键词	Advection; Atmospheric temperature; Boundary layers; Budget control; Cams; Oceanography; Soil moisture; Surface properties; Surface waters; aquaplanet with continents; ITCZ; Madden-Julian oscillation; Moist static energy; zonally symmetric SST; Climatology; air-sea interaction; atmospheric general circulation model; atmospheric modeling; boundary condition; boundary layer; intertropical convergence zone; Madden-Julian oscillation; moisture content; orography; sea surface temperature; soil moisture
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156908
作者单位	Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru, India; Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru, India
推荐引用方式 GB/T 7714	Das S.,Sengupta D.,Chakraborty A.. The Madden-Julian Oscillation in an Aquaplanet-Like General Circulation Model With and Without Continents[J],2019,11(5).
APA	Das S.,Sengupta D.,&Chakraborty A..(2019).The Madden-Julian Oscillation in an Aquaplanet-Like General Circulation Model With and Without Continents.Journal of Advances in Modeling Earth Systems,11(5).
MLA	Das S.,et al."The Madden-Julian Oscillation in an Aquaplanet-Like General Circulation Model With and Without Continents".Journal of Advances in Modeling Earth Systems 11.5(2019).