Mesoscale process-induced variation of the West India Coastal Current during the winter monsoon

2015 ◽  
Vol 187 (8) ◽  
Author(s):  
V. K. Jineesh ◽  
K. R. Muraleedharan ◽  
K. Lix John ◽  
C. Revichandran ◽  
P. V. Hareesh Kumar ◽  
...  
Keyword(s):  
Winter Monsoon ◽  
Coastal Current ◽  
The West ◽  
Induced Variation ◽  
Mesoscale Process

Observed variability of the West India Coastal Current on the continental shelf from 2010–2017

2021 ◽  
Vol 130 (2) ◽  
Author(s):  
Anya Chaudhuri ◽  
P Amol ◽  
D Shankar ◽  
S Mukhopadhyay ◽  
S G Aparna ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Coastal Current ◽  
The West

Circulation in the region of the West India Coastal Current in March 1994 hydrographic and altimeter data

2022 ◽  
Vol 131 (1) ◽  
Author(s):  
V Vijith ◽  
S R Shetye ◽  
A D Gouveia ◽  
S S C Shenoi ◽  
G S Michael ◽  
...  
Keyword(s):  
Altimeter Data ◽  
Coastal Current ◽  
The West

Observed variability of the West India Coastal Current on the continental slope from 2009–2018

2020 ◽  
Vol 129 (1) ◽  
Author(s):  
Anya Chaudhuri ◽  
D Shankar ◽  
S G Aparna ◽  
P Amol ◽  
V Fernando ◽  
...  
Keyword(s):  
Continental Slope ◽  
Coastal Current ◽  
The West

Inhibition of mixed-layer deepening during winter in the northeastern Arabian Sea by the West India Coastal Current

2015 ◽  
Vol 47 (3-4) ◽  
pp. 1049-1072 ◽  
Author(s):  
D. Shankar ◽  
R. Remya ◽  
P. N. Vinayachandran ◽  
Abhisek Chatterjee ◽  
Ambica Behera
Keyword(s):  
Mixed Layer ◽  
Arabian Sea ◽  
Coastal Current ◽  
The West

Neoglacial Ice Advance and Sediment Provenance Changes in Southwest Greenland and its Marginal Seas Traced by Radiogenic Isotopes

2020 ◽  
Author(s):  
Lina Madaj ◽  
Claude Hillaire-Marcel ◽  
Friedrich Lucassen ◽  
Simone Kasemann
Keyword(s):  
Marine Sediments ◽  
Deep Water ◽  
Radiogenic Isotopes ◽  
Labrador Sea ◽  
Coastal Current ◽  
Deep Water Formation ◽  
The West ◽  
The Holocene ◽  
Water Formation ◽  
Southwest Greenland

<p>Marine sediments from the West Greenland margin represent high-resolution archives of Holocene climate history, past ice sheet dynamics, changes in meltwater discharge and coastal current intensities. We investigate potential changes of sediment provenances using strontium (Sr) and neodymium (Nd) radiogenic isotopes as tracers for the origin and pathways of the silicate detrital fraction in marine sediments. Meltwater discharge and coastal currents are the most important transport pathways for detrital sediments into (northeast) Labrador Sea, which is an important pathway for freshwater from the Arctic Ocean and meltwater from the Greenland Ice Sheet to enter the North Atlantic, where deep water formation takes place. Variations in freshwater supply into Labrador Sea may influence deep water formation and therefore further circulation and climate patterns on a global scale.</p><p>The marine sediment record collected in Nuuk Trough, southwest Greenland, displays uniform isotopic compositions throughout most of the Holocene, indicating well mixed detrital material from local sources through meltwater discharge and distal sources transported via the West Greenland Current. From around 4 ka BP to present the composition of Nd isotopes reveals a steep (εNd: -29 to -35) and the Sr isotope composition a slight (<sup>87</sup>Sr/<sup>86</sup>Sr: 0.723 to 0.728) but pronounced shift. This time interval coincides with the transition into the Neoglacial time period [1], which is characterized by a significant drop in atmospheric temperatures [2], and the onset of the modern Labrador Sea circulation pattern (e.g. [3]). We suggest that the shift in Nd and Sr isotopes indicates a change towards less distal and more local sediment sources, possibly caused by enhanced erosion of the local bedrock during Neoglacial ice advance [4], along with a decrease in meltwater discharge [5] and coastal current strength, leading to a sediment delivery shift.</p><p>[1] Funder & Fredskild (1989) Quaternary geology of Canada and Greenland, 775–783. [2] Seidenkrantz et al. (2007) The Holocene 17, 387-401. [3] Fagel et al. (2004) Paleoceanography 19, PA3002. [4] Funder et al. (2011) Developments in Quaternary Sciences 15, 699-713, (and references therein). [5] Møller et al. (2006) The Holocene 16, 685-695.</p>

Cross Flows in the Taiwan Strait in Winter*

2014 ◽  
Vol 44 (3) ◽  
pp. 801-817 ◽  
Author(s):  
L.-Y. Oey ◽  
Y.-L. Chang ◽  
Y.-C. Lin ◽  
M.-C. Chang ◽  
S. Varlamov ◽  
...  
Keyword(s):  
Cold Water ◽  
Numerical Models ◽  
Taiwan Strait ◽  
Finite Amplitude ◽  
Winter Monsoon ◽  
Coastal Current ◽  
Wind Regime ◽  
Calanus Sinicus ◽  
Northeasterly Wind ◽  
The Taiwan Strait

Abstract In winter, a branch of the China Coastal Current can turn in the Taiwan Strait to join the poleward-flowing Taiwan Coastal Current. The associated cross-strait flows have been inferred from hydrographic and satellite data, from observed abundances off northwestern Taiwan of cold-water copepod species Calanus sinicus and, in late March of 2012, also from debris found along the northwestern shore of Taiwan of a ship that broke two weeks earlier off the coast of China. The dynamics related to such cross flows have not been previously explained and are the focus of this study using analytical and numerical models. It is shown that the strait’s currents can be classified into three regimes depending on the strength of the winter monsoon: equatorward (poleward) for northeasterly winds stronger (weaker) than an upper (lower) bound and cross-strait flows for relaxing northeasterly winds between the two bounds. These regimes are related to the formation of the stationary Rossby wave over the Changyun Ridge off midwestern Taiwan. In the weak (strong) northeasterly wind regime, a weak (no) wave is produced. In the relaxing wind regime, cross-strait currents are triggered by an imbalance between the pressure gradient and wind and are amplified by the finite-amplitude meander downstream of the ridge where a strong cyclone develops.

scholarly journals Study of the Effective Factors on Shelf Currents in the Southern Caspian Sea

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Maryam ShieaAli
Keyword(s):  
Caspian Sea ◽  
Low Frequency ◽  
Coastal Current ◽  
Surface Currents ◽  
Measured Temperature ◽  
The Caspian Sea ◽  
The West ◽  
Southwestern Part ◽  
Significant Difference ◽  
Weak Winds

The current and wind records and the physical parameter structures such as temperature and salinity in the southwestern part of the Caspian Sea adjacent to Anzali Port were investigated from November 2004 up to the end of January 2005. Results show that, despite the existence of relatively weak winds along the coast in the area, the measurements indicate strong long shore currents. However, when heavy wind tension is observed in the area, then strong currents are also present, which - from the perspective of direction – also have good coordination with the wind. The direction of dominated currents was parallel to the coast from the west to the east. In most cases, the flow rate was identical from the surface to the seabed, and in this condition - because the values of the measured temperature points were almost identical-barotropic currents were present. However, in the autumn at some region, a significant difference was observed between the surface currents and subsurface currents due to temperature differences that affected the density and caused the creation of barclinic currents. Due to the high velocity of currents compared to wind velocity, and the intense slope of the coast and low-frequency movements in the area, we can hypothesize the existence of motions such as Kelvin waves and conclude that the effect of the wind compared to the other factors of the coastal current in the area was weaker.

scholarly journals Mean Conditions and Seasonality of the West Greenland Boundary Current System near Cape Farewell

2020 ◽  
Vol 50 (10) ◽  
pp. 2849-2871
Author(s):  
Astrid Pacini ◽  
Robert S. Pickart ◽  
Frank Bahr ◽  
Daniel J. Torres ◽  
Andrée L. Ramsey ◽  
...  
Keyword(s):  
Current System ◽  
Labrador Sea ◽  
Western Boundary ◽  
Coastal Current ◽  
Boundary Current ◽  
The West ◽  
West Greenland ◽  
Irminger Sea ◽  
West Greenland Current ◽  
Recirculation Gyre

AbstractThe structure, transport, and seasonal variability of the West Greenland boundary current system near Cape Farewell are investigated using a high-resolution mooring array deployed from 2014 to 2018. The boundary current system is comprised of three components: the West Greenland Coastal Current, which advects cold and fresh Upper Polar Water (UPW); the West Greenland Current, which transports warm and salty Irminger Water (IW) along the upper slope and UPW at the surface; and the Deep Western Boundary Current, which advects dense overflow waters. Labrador Sea Water (LSW) is prevalent at the seaward side of the array within an offshore recirculation gyre and at the base of the West Greenland Current. The 4-yr mean transport of the full boundary current system is 31.1 ± 7.4 Sv (1 Sv ≡ 106 m3 s−1), with no clear seasonal signal. However, the individual water mass components exhibit seasonal cycles in hydrographic properties and transport. LSW penetrates the boundary current locally, through entrainment/mixing from the adjacent recirculation gyre, and also enters the current upstream in the Irminger Sea. IW is modified through air–sea interaction during winter along the length of its trajectory around the Irminger Sea, which converts some of the water to LSW. This, together with the seasonal increase in LSW entering the current, results in an anticorrelation in transport between these two water masses. The seasonality in UPW transport can be explained by remote wind forcing and subsequent adjustment via coastal trapped waves. Our results provide the first quantitatively robust observational description of the boundary current in the eastern Labrador Sea.

scholarly journals Observational evidence for remote forcing of the West India Coastal Current

2008 ◽  
Vol 113 (C11) ◽  
Author(s):  
S. R. Shetye ◽  
I. Suresh ◽  
D. Shankar ◽  
D. Sundar ◽  
S. Jayakumar ◽  
...  
Keyword(s):  
Observational Evidence ◽  
Coastal Current ◽  
The West ◽  
Remote Forcing
Sign in / Sign up

Export Citation Format

Share Document