NDLI: Diagnosis of boreal summer intraseasonal oscillation in high resolution NCEP climate forecast system

Content Provider	Springer Nature Link
Author	Abhik, S. Mukhopadhyay, P. Krishna, R. P. M. Salunke, Kiran D. Dhakate, Ashish R. Rao, Suryachandra A.
Copyright Year	2015
Abstract	The present study examines the ability of high resolution (T382) National Centers for Environmental Prediction coupled atmosphere–ocean climate forecast system version 2 (CFS T382) in simulating the salient spatio-temporal characteristics of the boreal summertime mean climate and the intraseasonal variability. The shortcomings of the model are identified based on the observation and compared with earlier reported biases of the coarser resolution of CFS (CFS T126). It is found that the CFS T382 reasonably mimics the observed features of basic state climate during boreal summer. But some prominent biases are noted in simulating the precipitation, tropospheric temperature (TT) and sea surface temperature (SST) over the global tropics. Although CFS T382 primarily reproduces the observed distribution of the intraseasonal variability over the Indian summer monsoon region, some difficulty remains in simulating the boreal summer intraseasonal oscillation (BSISO) characteristics. The simulated eastward propagation of BSISO decays rapidly across the Maritime Continent, while the northward propagation appears to be slightly slower than observation. However, the northward propagating BSISO convection propagates smoothly from the equatorial region to the northern latitudes with observed magnitude. Moreover, the observed northwest-southeast tilted rain band is not well reproduced in CFS T382. The warm mean SST bias and inadequate simulation of high frequency modes appear to be responsible for the weak simulation of eastward propagating BSISO. Unlike CFS T126, the simulated mean SST and TT exhibit warm biases, although the mean precipitation and simulated BSISO characteristics are largely similar in both the resolutions of CFS. Further analysis of the convectively coupled equatorial waves (CCEWs) indicates that model overestimates the gravest equatorial Rossby waves and underestimates the Kelvin and mixed Rossby-gravity waves. Based on analysis of CCEWs, the study further explains the possible reasons behind the realistic simulation of northward propagating BSISO in CFS T382, even though the model shows substantial biases in simulating mean state and other BSISO modes.
Starting Page	3287
Ending Page	3303
Page Count	17
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	46
Issue Number	9-10
e-ISSN	14320894
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Boreal summer intraseasonal oscillation (BSISO) Convectively coupled equatorial waves NCEP CFS model Geophysics/Geodesy Climatology Oceanography
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Teleconnections associated with Northern Hemisphere summer monsoon intraseasonal oscillation

Changes in the boreal summer intraseasonal oscillation projected by the CNRM-CM5 model under the RCP 8.5 scenario

Decadal change in the boreal summer intraseasonal oscillation

Multi-week prediction of South-East Asia rainfall variability during boreal summer in CFSv2

Prediction of summer monsoon rainfall over India using the NCEP climate forecast system

Madden-julian oscillation and convectively coupled equatorial waves simulated in the ncep global forecast system and climate forecast system models.

Tropical variability and stratospheric equatorial waves in the IPSLCM5 model

Predictable patterns of the Asian and Indo-Pacific summer precipitation in the NCEP CFS

ENSO, IOD and Indian Summer Monsoon in NCEP climate forecast system

Diagnosis of boreal summer intraseasonal oscillation in high resolution NCEP climate forecast system

Similar Documents

Teleconnections associated with Northern Hemisphere summer monsoon intraseasonal oscillation

Changes in the boreal summer intraseasonal oscillation projected by the CNRM-CM5 model under the RCP 8.5 scenario

Decadal change in the boreal summer intraseasonal oscillation

Multi-week prediction of South-East Asia rainfall variability during boreal summer in CFSv2

Prediction of summer monsoon rainfall over India using the NCEP climate forecast system

Madden-julian oscillation and convectively coupled equatorial waves simulated in the ncep global forecast system and climate forecast system models.

Tropical variability and stratospheric equatorial waves in the IPSLCM5 model

Predictable patterns of the Asian and Indo-Pacific summer precipitation in the NCEP CFS

ENSO, IOD and Indian Summer Monsoon in NCEP climate forecast system

Diagnosis of boreal summer intraseasonal oscillation in high resolution NCEP climate forecast system