Sea surface height anomaly and upper ocean temperature over the Indian Ocean during contrasting monsoons

Gera, Anitha; Mitra, Ashis K.; Mahapatra, D. K.; Momin, Imranali M.; Rajagopal, E. N.; Basu, Swati

doi:10.1016/j.dynatmoce.2016.04.002

Cited by 14 publications

(12 citation statements)

References 85 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent study by Gera et al . () showed the link of SLA to contrasting monsoon via variability in the upper ocean heat content. Shankar et al .…”

Section: Introductionmentioning

confidence: 99%

“…Basu et al (2000) analysed TOPEX/POSEIDON altimeter data and reduced gravity model simulations to study annual and interannual sea level variations to the north of 10 ∘ S in the Indian Ocean. Recent study by Gera et al (2016) showed the link of SLA to contrasting monsoon via variability in the upper ocean heat content. Shankar et al (2010) reported from wavelet analysis of altimeter sea level data that the Indian Ocean regions display high variability at all time scales and interannual periods of minima (maxima) occur where the direct wind forcing and reflected Rossby waves interfere destructively (constructively).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model

Deepa

Gnanaseelan

Kakatkar

et al. 2017

Intl Journal of Climatology

View full text Add to dashboard Cite

The study finds that co‐occurrence years (years when IOD and El Niño events co‐occur) contribute significantly towards the interannual variability in the Indian Ocean. Carefully designed Ocean General Circulation Model (OGCM) captured the observed variability. The OGCM experiments are carried out by modulating the forcing fields over the Pacific and the Indian Ocean to understand the physical mechanisms causing sea level variability in the Indian Ocean. Decadal variability in the ENSO is primarily contributing to the decadal variability in the Indian Ocean sea level.

show abstract

“…Recent study by Gera et al . () showed the link of SLA to contrasting monsoon via variability in the upper ocean heat content. Shankar et al .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model

Deepa

Gnanaseelan

Kakatkar

et al. 2017

Intl Journal of Climatology

View full text Add to dashboard Cite

show abstract

“…Joseph and Xavier (1999) also found a 40-year periodicity in the frequency of TCs in the BOB basin. The role of UOHC in enhancing convection and providing heat supply for more number of low pressure systems formed over the BOB during 2010 compared to 2009 monsoon season also discussed by previous study (Gera et al 2013).…”

Section: Introductionmentioning

confidence: 60%

Decadal variation of ocean heat content and tropical cyclone activity over the Bay of Bengal

Nath¹,

Kotal²,

Kundu

2016

J Earth Syst Sci

View full text Add to dashboard Cite

The upper ocean heat content up to 700 m depth (OHC 700) is an important climatic parameter required for atmospheric and oceanographic studies like a cyclone. In this study, therefore, an attempt has been made to examine the inter-decadal variations of tropical cyclone (TC) activity and OHC 700 over the Bay of Bengal (BOB) for the post-monsoon season (October-December) during 1955-2013 periods. The sea-surface temperature (SST), geopotential height at 500 hPa, low-level vorticity at 850 hPa, vertical wind shear between 200 and 850 hPa, middle tropospheric humidity at 500 hPa and outgoing long-wave radiation are also being studied using seasonal mean data. The results show a significant inter-decadal variation during 1955-2013, with two distinct decadal periods: active decadal period (ADP) (1955-1988) and inactive decadal period (IDP) (1989-2013). The anomalies of these parameters are opposite in phase for two periods. It is found that the large scale atmospheric features and oceanic parameters have significant inter-decadal variability, but frequency of the tropical cyclone is attributed to the variation in the atmospheric dynamic and thermodynamic conditions rather than the variation of oceanic parameters OHC 700 and SSTs during the post-monsoon season.

show abstract

“…Particularly, during 2003–2012, a large portion of the heat taken up by the upper Pacific ocean flowed into the southeastern IO through the strengthened Indonesian throughflow, explaining the slowdown in global surface warming during this period 28 , 32 , 33 . Despite this large-scale contribution of heat to the southeastern IO, SL variations northward of 20 S were mostly related to thermosteric component driven by the internal distribution of heat connected to natural variabilities in regional/distant climatic systems that affect the wind patterns over the IO 29 – 31 , 35 – 38 . Specifically, the intensified SL rise in the northern IO over the past two decades has been associated with wind-driven meridional heat transfer and surface turbulent heat flux 30 or the weakening of the summer Indian monsoon winds 36 , 38 , which reduced upwelling in the Arabian Sea and its associated southward heat transfer, increasing the heat content in the northern IO.…”

Section: Flow Transport Record Through the Suez Canalmentioning

confidence: 99%

Possible implications of sea level changes for species migration through the Suez Canal

Biton

2020

Sci Rep

View full text Add to dashboard Cite

The Mediterranean and Red Sea, which were connected via the Suez Canal during the 19th century after eons of separation, host two distinctive ecosystems. Species invasion through the Suez Canal from the Red Sea vastly influences the ecology of the Mediterranean, but the level of reverse migration is assumed to be negligible. We present the first reconstructed flow transport record through the canal during the period 1923–2016. According to this reconstruction, the flow intensity and direction through the canal are strongly influenced by seasonal and long-term sea-level changes, which could also play a role in the characteristics of species migration through it. Our record not only supports previous observations of the unidirectional invasion until the 1980s and the accelerated species migration rates to the Mediterranean ever since, but also suggest that southward migration could have become possible since the early 1980s. The southward flow was primarily enhanced by Indian Ocean cooling and the Eastern Mediterranean Transition in deep water formation during the period 1980–2000. It was then gradually reduced by accelerated sea-level rise in the northern Indian Ocean.

show abstract

Sea surface height anomaly and upper ocean temperature over the Indian Ocean during contrasting monsoons

Cited by 14 publications

References 85 publications

The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model

The interannual sea level variability in the Indian Ocean as simulated by an Ocean General Circulation Model

Decadal variation of ocean heat content and tropical cyclone activity over the Bay of Bengal

Possible implications of sea level changes for species migration through the Suez Canal

Contact Info

Product

Resources

About