NDLI: The Preferred Structure of the Interannual Indian Monsoon Variability

Content Provider	Springer Nature Link
Author	Straus, David M. Krishnamurthy, V.
Copyright Year	2007
Abstract	The leading empirical orthogonal function (EOF) of the June-Sept. mean, rotational horizontal wind at 850 hPa and 200 hPa (over the region 12.5°S–42.5°N, 50°E–100°E) from 56 years (1948–2003) of reanalysis (from the National Centers for Environmental Prediction) shows strong anti-cyclonic circulation at upper levels, strong Indian Ocean cross-equatorial flow and on-shore flow over western India at lower levels . The associated principal component (PC) is correlated at the 0.75 level with the seasonal mean observed Indian Monsoon rainfall (IMR). Composite differences of vertically integrated divergence (surface to 800 hPa) and vorticity (surface to 500 hPa) between ``strong'' years (PC-1 exceeds one standard deviation σ) and ``weak'' years (PC-1 less than − σ) suggest increased rising motion and storminess over the Bay of Bengal and central India. Composite difference maps of station rainfall from the India Meteorological Department (IMD) between strong years and normal years (weak years and normal years) are statistically significant over central India, with strong (weak) years associated with increased (decreased) precipitation. In both cases the maps of rainfall anomalies are of one sign throughout India. The correlation of PC-1 with global seasonal mean SST is strong and negative over the eastern equatorial Pacific, but positive in a surrounding horse-shoe like region. Significant negative correlation occurs in the northwestern Indian Ocean. The lag/lead correlation between the NINO3 SST index and PC-1 is similar to but stronger than the NINO3/IMR correlation. Modest (but significant) negative correlation is seen when NINO3 leads PC-1 (or IMR) by one-two months. Strong negative correlation is seen when PC-1 (or IMR) leads NINO3. The projections of running five-day means of horizontal rotational winds at 850 and 200 hPa onto EOF-1 (after removing the seasonal mean for each year) were pooled for strong, normal and weak years. The strong and normal year probability distribution functions (pdfs) are nearly indistinguishable, but the weak year pdf has more weight for moderate negative values and in both extreme tails and shows some hint of bi-modality.
Starting Page	1717
Ending Page	1732
Page Count	16
File Format	PDF
ISSN	00334553
Journal	Pure and applied geophysics
Volume Number	164
Issue Number	8
e-ISSN	14209136
Language	English
Publisher	Birkhäuser-Verlag
Publisher Date	2007-06-23
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Indian Monsoon inter-annual variability circulation Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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

Simulation of South-Asian Summer Monsoon in a GCM

Summer Monsoon Rainfall Variability Over Maharashtra, India

Mean state and interannual variability of the Indian summer monsoon simulation by NCEP CFSv2

Sensitivity of Initial Conditions on Diurnal Variability of Indian Summer Monsoon

Interactive Aspects of the Indian and the African Summer Monsoon Systems

Interannual Variability of Snow Water Equivalent (SWE) over Western Himalayas

Diagnostic study on seasonality and interannual variability of wind field

Extratropical influences on the inter-annual variability of South-Asian monsoon

Sub-seasonal interannual variability associated with the excess and deficit Indian winter monsoon over the Western Himalayas

The Preferred Structure of the Interannual Indian Monsoon Variability

Similar Documents

Simulation of South-Asian Summer Monsoon in a GCM

Summer Monsoon Rainfall Variability Over Maharashtra, India

Mean state and interannual variability of the Indian summer monsoon simulation by NCEP CFSv2

Sensitivity of Initial Conditions on Diurnal Variability of Indian Summer Monsoon

Interactive Aspects of the Indian and the African Summer Monsoon Systems

Interannual Variability of Snow Water Equivalent (SWE) over Western Himalayas

Diagnostic study on seasonality and interannual variability of wind field

Extratropical influences on the inter-annual variability of South-Asian monsoon

Sub-seasonal interannual variability associated with the excess and deficit Indian winter monsoon over the Western Himalayas

The Preferred Structure of the Interannual Indian Monsoon Variability