Island wake circulation off Maldives during boreal winter, as visualised with MODIS derived chlorophyll‐<i>a</i>data and other satellite measurements

Sasamal, S. K.

doi:10.1080/01431160600858459

Cited by 23 publications

(15 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Remote sensing data tracing chlorophyll-α concentrations in and around the Maldives show that currents inject high nutrient contents into the shallow water (Sasamal, 2007;Anderson et al, 2011). Temporarily, these nutrient injections induce chlorophyll-α concentrations of 0.34 mg/m 3 thus placing the carbonate factory near the coral turn on/turn off zone (Schlager, 2005).…”

Section: An Incipiently Drowned Carbonate Bank?mentioning

confidence: 97%

The leaking bucket of a Maldives atoll: Implications for the understanding of carbonate platform drowning

et al. 2015

View full text Add to dashboard Cite

Section: An Incipiently Drowned Carbonate Bank?mentioning

confidence: 97%

The leaking bucket of a Maldives atoll: Implications for the understanding of carbonate platform drowning

et al. 2015

View full text Add to dashboard Cite

“…In addition to the aeolian influx, sea-level fluctuations and bottom currents played a significant role in the evolution of the sedimentary system of the Maldives (Betzler et al, 2009(Betzler et al, , 2013a(Betzler et al, , 2016Lüdmann et al, 2013). Relative sea-level highstands caused a flooding of the carbonate platforms and an export of shallow-water carbonate sediments into the adjacent basins, whereas sea-level lowstands caused an exposure of the platforms and likely a strengthened restriction of the Inner Sea area (Schlager et al, 1994;Paul et al, 2012;Lüdmann et al, 2013;Betzler et al, 2013bBetzler et al, , 2016. Moreover, previous studies have shown that during times of restricted water circulation in the Inner Sea, the deposition of organic matter was likewise facilitated (Betzler et al, 2016).…”

mentioning

confidence: 99%

A multi-proxy analysis of Late Quaternary ocean and climate variability for the Maldives, Inner Sea

et al. 2017

View full text Add to dashboard Cite

As a natural sediment trap, the marine sediments of the sheltered central part of the Maldives Inner Sea represent an exceptional archive for paleoenvironmental and climate changes in the equatorial Indian Ocean. To evaluate the complex interplay between high-latitude and monsoonal climate variability, related dust fluxes, and regional oceanographic responses, we focused on Fe / Al, Ti / Al and Si / Ca ratios as proxies for terrigenous sediment delivery and total organic carbon (TOC) and Br XRF counts as proxies for marine productivity. Benthic foraminiferal fauna distributions, grain size and stable δ 18 O and δ 13 C data were used for evaluating changes in the benthic ecosystem and changes in the intermediate water circulation, bottom water current velocity and oxygenation.Our multi-proxy data record reveals an enhanced dust supply during the glacial intervals, causing elevated Fe / Al and Si / Ca ratios, an overall coarsening of the sediment and an increasing amount of agglutinated benthic foraminifera. The enhanced dust fluxes can be attributed to higher dust availability in the Asian desert and loess areas and its transport by intensified winter monsoon winds during glacial conditions. These combined effects of wind-induced mixing of surface waters and dust fertilization during the cold phases resulted in an increased surface water productivity and related organic carbon fluxes. Thus, the development of highly diverse benthic foraminiferal faunas with certain detritus and suspension feeders was fostered. The difference in the δ 13 C signal between epifaunal and deep infaunal benthic foraminifera reveals intermediate water oxygen concentrations between ap-proximately 40 and 100 µmol kg −1 during this time. The precessional fluctuation pattern of oxygen changes resembles that from the deep Arabian Sea, suggesting an expansion of the oxygen minimum zone (OMZ) from the Arabian Sea into the tropical Indian Ocean with a probable regional signal of strengthened winter-monsoon-induced organic matter fluxes and oxygen consumption further controlled by the varying inflow intensity of the Antarctic Intermediate Water (AAIW). In addition, the bottom water oxygenation pattern of the Maldives Inner Sea reveals a long phase of reduced ventilation during the last glacial period. This process is likely linked to the combined effects of generally enhanced oxygen consumption rates during high-productivity phases, reduced AAIW production and the restriction of upper bathyal environments in the Inner Sea during sea-level lowstands. Thus, our multi-proxy record reflects a close linkage between the Indian monsoon oscillation, intermediate water circulation, productivity and sea-level changes on orbital timescale.

show abstract

“…This weakening has also been linked to the Indian monsoon and is seen to occur in the context of major climatic reorganization in the Indonesian-Australian and East African region. Therefore, there is a good correlation between the micropaleontological proxies indicating enhanced upwelling, which around the Maldives is nowadays linked to the monsoonal currents (Sasamal, 2007), and the grain-size variations showing distinct current regimes at the sea floor. The saw-tooth pattern of grain-size fluctuations is lost in deposits older than MIS 10.…”

Section: Current Vs Sea-level Signatures In the Sedimentary Record Tmentioning

confidence: 98%

Current and sea-level signals in periplatform ooze (Neogene, Maldives, Indian Ocean)

Betzler

Lüdmann

Hübscher

et al. 2013

Sedimentary Geology

View full text Add to dashboard Cite

Island wake circulation off Maldives during boreal winter, as visualised with MODIS derived chlorophyll‐adata and other satellite measurements

Cited by 23 publications

References 14 publications

The leaking bucket of a Maldives atoll: Implications for the understanding of carbonate platform drowning

The leaking bucket of a Maldives atoll: Implications for the understanding of carbonate platform drowning

A multi-proxy analysis of Late Quaternary ocean and climate variability for the Maldives, Inner Sea

Current and sea-level signals in periplatform ooze (Neogene, Maldives, Indian Ocean)

Contact Info

Product

Resources

About