Strong modulations on the Bay of Bengal monsoon onset vortex by the first northward-propagating intra-seasonal oscillation

Li, Kuiping; Li, Zhi; Yang, Yang; Xiang, Baoqiang; Liu, Yanliang; Yu, Weidong

doi:10.1007/s00382-015-2826-4

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i

Strong modulations on the Bay of Bengal monsoon onset vortex by the first northward-propagating intra-seasonal oscillation

2016
By Li, Kuiping ; Li, Zhi ; Yang, Yang ; ...
Source: Clim Dyn 47, 107–115

[PDF-1.23 MB]

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Journal Title:

Climate Dynamics
Personal Author:

Li, Kuiping ; Li, Zhi ; Yang, Yang ; Xiang, Baoqiang ; Liu, Yanliang ; ... More +

Li, Kuiping ; Li, Zhi ; Yang, Yang ; Xiang, Baoqiang ; Liu, Yanliang ; Yu, Weidong Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory)

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
Description:

Monsoon onset vortex (OV) in the form of tropical cyclone is often observed in the pre-monsoon period and contributes to the subsequent abrupt establishment of summer monsoon over the Bay of Bengal (BoB). It is identified here that all historical OVs occurred during the convection-enhanced phase of the first northward-propagating intra-seasonal oscillation (FNISO). The individual contributions from the four large scale environmental fields associated with the intra-seasonal variations to the cyclone genesis are diagnosed with the aid of the genesis potential index. The significant moistening of mid-level atmosphere, which is embedded in the FNISO convection-enhanced phase, is shown to be the primary factor leading to the cyclone genesis. The water vapor budget analysis is further done to understand the governing process for the mid-level humidity increase. It is clearly seen that the vertical advection process, dominated by the anomalous vertical advection of the mean vertical water vapor gradient, plays the critical role. Hence the OVs are shown to be strongly modulated by FNISOs, both of which are important elements of the complex story of the BoB monsoon onset.
Keywords:

[+]

Cyclones Intra-seasonal Oscillation Monsoon Onset Vortex
Source:

Clim Dyn 47, 107–115
DOI:

https://doi.org/10.1007/s00382-015-2826-4
Document Type:

Journal Article
Place as Subject:

Bay of Bengal
Rights Information:

CC BY
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Submitted
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urn:sha256:7d4df4290a13c36900e006b1389b4b539099b002b3fefcca9dd039f8c12f8ac1
Download URL:

https://repository.library.noaa.gov/view/noaa/29846/noaa_29846_DS1.pdf
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Strong modulations on the Bay of Bengal monsoon onset vortex by the first northward-propagating intra-seasonal oscillation

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