Assessing precipitation products in the Indian Ocean using an ocean model

Yu, Zuojun; McCreary, Julian P.

doi:10.1029/2003jc002106

Cited by 28 publications

(44 citation statements)

References 24 publications

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“…Although the GPCP precipitation data set is good for open oceans (Yu and McCreary 2004;Yin et al 2004), it does not provide the information as detail as we would like to have for some Pacific rim countries. Thus, additional in-situ rainfall data for the USA, Japan, and China are also used in the analyses.…”

Section: Methodsmentioning

confidence: 99%

Impacts of recent El Niño Modoki on dry/wet conditions in the Pacific rim during boreal summer

et al. 2007

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Section: Methodsmentioning

confidence: 99%

Impacts of recent El Niño Modoki on dry/wet conditions in the Pacific rim during boreal summer

et al. 2007

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“…However, there are patches of lower (22 psu) and higher (10.5 psu) SSS. These patches are seen as errors arising from the restoring of salinity in regions with large salinity gradients to the smoothed salinity products such as WOA05 (Yu and McCreary 2004). In such regions, SSS restoring is particularly sensitive to the chosen relaxation time scale.…”

Section: Design Of Experiments and Validation Of Salinity Fieldsmentioning

confidence: 99%

Seasonal Effects of Indian Ocean Freshwater Forcing in a Regional Coupled Model*

et al. 2009

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Effects of freshwater forcing from river discharge into the Indian Ocean on oceanic vertical structure and the Indian monsoons are investigated using a fully coupled, high-resolution, regional climate model. The effect of river discharge is included in the model by restoring sea surface salinity (SSS) toward observations. The simulations with and without this effect in the coupled model reveal a highly seasonal influence of salinity and the barrier layer (BL) on oceanic vertical density stratification, which is in turn linked to changes in sea surface temperature (SST), surface winds, and precipitation.During both boreal summer and winter, SSS relaxation leads to a more realistic spatial distribution of salinity and the BL in the model. In summer, the BL in the Bay of Bengal enhances the upper-ocean stratification and increases the SST near the river mouths where the freshwater forcing is largest. However, the warming is limited to the coastal ocean and the amplitude is not large enough to give a significant impact on monsoon rainfall.The strengthened BL during boreal winter leads to a shallower mixed layer. Atmospheric heat flux forcing acting on a thin mixed layer results in an extensive reduction of SST over the northern Indian Ocean. Relatively suppressed mixing below the mixed layer warms the subsurface layer, leading to a temperature inversion. The cooling of the sea surface induces a large-scale adjustment in the winter atmosphere with amplified northeasterly winds. This impedes atmospheric convection north of the equator while facilitating it in the austral summer intertropical convergence zone, resulting in a hemispheric-asymmetric response pattern. Overall, the results suggest that freshwater forcing from the river discharges plays an important role during the boreal winter by affecting SST and the coupled ocean-atmosphere interaction, with potential impacts on the broadscale regional climate.

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“…The recent study by Yu and McCreary (2004) suggests that these South India runoffs could be an important forcing factor of the Northern Indian Ocean SSS. We test the impact of this runoff using the more comprehensive runoff dataset of Fekete et al (2000) (Figure 3b; available online on A. Dai's website at http://www.cgd.ucar.edu/cas/adai/data-dai.html), which is based on the discharge dataset from the Global Runoff Data Centre (GRDC).…”

Section: Effect Of Runoff Forcingmentioning

confidence: 99%

“…It could also be that the salinity advected by the currents is erroneous owing to incorrect interior ocean forcing by precipitation and evaporation fluxes (Yu and McCreary, 2004).…”

Section: Effect Of Pamban Pass Flowmentioning

confidence: 99%

Modeling the Barrier-Layer Formation in the Southeastern Arabian Sea*

et al. 2007

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The effect of salinity on the formation of the barrier layer (BL) in the South-Eastern Arabian Sea (SEAS) is investigated using an ocean general circulation model. In accordance with previous studies, the runoff distribution and the India-Sri Lanka passage have a strong impact on the realism of the salinity simulated in the area at seasonal time scales. The model simulates a BL pattern in fairly good agreement with available observations. Eulerian and Lagrangian approaches show that the BL is formed by two complementary processes, the arrival of low-salinity surface waters that are cooled en route to the SEAS and downwelling of waters mostly local to the SEAS in the subsurface layers. The surface waters are partly of Bay-of-Bengal origin and are partly from the SEAS, but are cooled east and south of Sri Lanka in the model. That the downwelled subsurface waters are warm and are not cooled leads to temperature inversions in the BL. The main forcing for this appears to be remotelyforced planetary waves.

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Assessing precipitation products in the Indian Ocean using an ocean model

Cited by 28 publications

References 24 publications

Impacts of recent El Niño Modoki on dry/wet conditions in the Pacific rim during boreal summer

Impacts of recent El Niño Modoki on dry/wet conditions in the Pacific rim during boreal summer

Seasonal Effects of Indian Ocean Freshwater Forcing in a Regional Coupled Model*

Modeling the Barrier-Layer Formation in the Southeastern Arabian Sea*

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