Seasonal variability of bio-optical and physical properties in the Arabian Sea: October 1994–October 1995

Dickey, Tommy D.; Marra, John; Sigurdson, David; Weller, Robert A.; Kinkade, Christopher S.; Zedler, Sarah E.; Wiggert, Jerry D.; Langdon, C.

doi:10.1016/s0967-0645(98)00061-7

Cited by 116 publications

(57 citation statements)

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“…This is shown in Figure 15, when a snapshot from REG, of the relative vorticity and horizontal velocities at the surface in August shows such eastward movement. Despite the model resolution, it is also clear that in the model the eastward transport is mediated by mesoscale structures, in the form of eddies and elongated filaments, in agreement with previous works (Dickey et al, 1998;Kawamiya, 2001;Resplandy et al, 2011). …”

Section: Model Resultssupporting

confidence: 90%

“…The atmospheric response to STA anomalies over the Arabian Sea projects on the monsoonal circulation, strengthening the monsoonal westerly winds that blow from the African coasts towards India. The horizontal advection of surface and near surface waters from the coast of Oman towards the center of the basin, typical of the summer season (Young and Kindle, 1994;Keen et al, 1997;Dickey et al, 1998), is therefore intensified. This is shown in Figure 15, when a snapshot from REG, of the relative vorticity and horizontal velocities at the surface in August shows such eastward movement.…”

Section: Model Resultsmentioning

confidence: 99%

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Arabian Sea ecosystem responses to the South Tropical Atlantic teleconnection

Barimalala

Bracco

Kucharski

et al. 2013

Journal of Marine Systems

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Section: Model Resultssupporting

confidence: 90%

Section: Model Resultsmentioning

confidence: 99%

Arabian Sea ecosystem responses to the South Tropical Atlantic teleconnection

Barimalala

Bracco

Kucharski

et al. 2013

Journal of Marine Systems

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“…As a consequence, the chlorophyll-a peak in this region lasts through the entire SWM season. Banse and English (2000) and Dickey et al (1998) also showed that chlorophyll-a concentration increases during the late SWM season and extends in to the fall inter-monsoon.…”

Section: Discussionmentioning

confidence: 89%

Inter-annual Variability of Chlorophyll-a in the Arabian Sea and its Gulfs

Sarma

Azri²,

Smith³

2012

ijms

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The analysis of chlorophyll-a for a 7 year period from the ocean color images of SeaWiFS in the Arabian Sea and its marginal seas showed considerable inter-annual and geographical variability. The variability in chlorophyll-a was essentially centered on the Southwest and the Northeast monsoon seasons. The mean seasonal chlorophyll-a of the Northeast Monsoon in the western Arabian Sea showed an increasing trend from 1998 to 2004. The period of elevated chlorophyll-a levels in the Gulf of Mannar is apparently extended due to advection of chlorophyll-a rich water from the Bay of Bengal along the east coast of India. The mean distribution of chlorophyll-a from the SeaWiFS images shows a coastally trapped chlorophyll-a rich front from the east coast of India that enriches the Gulf of Mannar and continues northward along the west coast of India. As this front moves northward along the coast, the southern coastal waters turn oligotrophic. The chlorophyll-a concentration in the region is also influenced by the large-scale climatic events such as El Nino/La Nina during 1998-1999.The chlorophyll-a data from selected locations were subjected to spectral analysis to extract periodic signals. The annual signal was found to be dominant in the areas affected by only one of the two monsoons such as the Gulf of Mannar. The semiannual signal was predominant in areas affected by both the monsoons such as western and northern Arabian Sea. We built an empirical model incorporating the annual and semiannual modes of chlorophyll-a from the ocean color data. The ratio of the standard deviations of SeaWiFS-observed to the modeled chlorophyll-a, taken as a measure of model suitability, varied between 0.71 and 0.86. Thus the chlorophyll-a variability in this region can reasonably be predicted using the empirical model developed in this study.

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“…During boreal winter, the Eurasian continent cools, and a high-pressure region develops on the Tibetan Plateau, resulting in cold and dry northerly or northeasterly winds (e.g. Smith and Madhupratap, 2005) and leading to strong evaporative cooling (Dickey et al, 1998). These diverse physical processes cause substantial variations in marine biogeochemical and ecosystem response.…”

Section: Introductionmentioning

confidence: 99%

Physical control of interannual variations of the winter chlorophyll bloom in the northern Arabian Sea

et al. 2017

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Abstract. The northern Arabian Sea hosts a winter chlorophyll bloom, triggered by convective overturning in response to cold and dry northeasterly monsoon winds. Previous studies of interannual variations of this bloom only relied on a couple of years of data and reached no consensus on the associated processes. The current study aims at identifying these processes using both ∼ 10 years of observations (including remotely sensed chlorophyll data and physical parameters derived from Argo data) and a 20-year-long coupled biophysical ocean model simulation. Despite discrepancies in the estimated bloom amplitude, the six different remotely sensed chlorophyll products analysed in this study display a good phase agreement at seasonal and interannual timescales. The model and observations both indicate that the interannual winter bloom fluctuations are strongly tied to interannual mixed layer depth anomalies (∼ 0.6 to 0.7 correlation), which are themselves controlled by the net heat flux at the air-sea interface. Our modelling results suggest that the mixed layer depth control of the bloom amplitude ensues from the modulation of nutrient entrainment into the euphotic layer. In contrast, the model and observations both display insignificant correlations between the bloom amplitude and thermocline depth, which precludes a control of the bloom amplitude by daily dilution down to the thermocline depth, as suggested in a previous study.

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Seasonal variability of bio-optical and physical properties in the Arabian Sea: October 1994–October 1995

Cited by 116 publications

References 0 publications

Arabian Sea ecosystem responses to the South Tropical Atlantic teleconnection

Arabian Sea ecosystem responses to the South Tropical Atlantic teleconnection

Inter-annual Variability of Chlorophyll-a in the Arabian Sea and its Gulfs

Physical control of interannual variations of the winter chlorophyll bloom in the northern Arabian Sea

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