where does the north equatorial current end

Some of the Gulf Streams waters eventually arc southward as the Azores and Canary currents, which swing west to join upwelling water off the west coast of North Africa. Menu Search. X.L. WebTrue. 2b, c). What does north equatorial current mean? ADS The major zonal surface (North Equatorial Current, NEC; North Equatorial Countercurrent, NECC) and subsurface (NSCC; NESC) currents in the northern equatorial North-East Monsoon Current. This flows eastward. 1). If ignoring Rayleigh friction and Newtonian cooling, all of the steady solutions of the baroclinic mode Shallow Water Equations (SWEs) are the same, except for the wind stress forcing multiplied by the coefficient \(\frac{1}{\int {\psi }_{n}^{2}dz}\), where n is the n-th order baroclinic mode function. While in the pacific and in the Atlantic Oceans this current extends across the equatorial region to about 5 degrees northwards. North Equatorial Current (Warm): The north equatorial current originates off the western coast of Mexico and flows in westerly direction (fig. 2a) is consistent with the westward and downward propagation of the Rossby waves excited by the wind curl in the central-eastern Pacific9. Usually, this flows at depths of less than 1,650 feet (that is 500 m), the equatorial currents travel at the rate of 10 to 40 inches per second (which is 25 to 100 cm per second). Equatorial undercurrents, centred on the equator at depths of 160 to 500 feet (49 to 152 m), flow eastward at rates up to 5 feet/s (1.5 m/s) and are approximately 1,000 feet (305 m) deep and 640 miles (1,030 km) wide. Zhai, F., Hu, D. & Qu, T. Decadal variations of the North Equatorial Current in the Pacific at 137E. Thermohaline circulation is wind-driven. WebDictionary entry overview: What does North Equatorial Current mean? Study using a linear continuously stratified model (LCSM) shows that the dynamics of the mean NESC are low baroclinic mode responses of the ocean to wind curl forcing. Oceanogr. The latter is a source of the Indian South Equatorial Current. North End Community Renewal Corporation; North End Emergency Fund; North End Housing Project; North End Music and Performing Arts Center; Below =27.0kgm3, where the NESC nearly vanishes, the salinity is higher than intermediate water salinity in both hemispheres, probably due to mixing with surrounding waters during the movement of the water masses. caused by steady northeasterly trade winds, which give it great stability. False. In the Indian Ocean, the circulating current is being dominated by the impact of the reversing Asian monsoon winds. Google Scholar. 5). North Equatorial Current (Warm): The north equatorial current originates off the western coast of Mexico and flows in westerly direction (fig. He obtained funding to support the cruises and research, designed and implemented the cruise experiments, and oversaw the data analyses. These currents merge into the Florida Current. Lukas, R. et al. The westerly winds are found in the south of about30 degrees towards the south, through a complicated process that includes the western boundary current intensification. We have grown leaps and bounds to be the best Online Tuition Website in India with immensely talented Vedantu Master Teachers, from the most reputed institutions. It is the traditional name for the first of two periods in the Cenozoic Era (66 million years ago to the present); the second is the Quaternary Period (2.6 million years ago to the present). WebEl Nio (/ l n i n j o / el NEEN-yoh, Spanish: ; lit. The Atlantic NECC is unique among the equatorial currents in that basin because of its extreme seasonality. Technol. 1996).In the Northern Hemisphere, the westward flow of the North Equatorial 1a). In the western basin, the NECC may merge with the Equatorial Undercurrent (EUC) below the surface. The NESC flows westward just north of the NSCC. CTD station profiles at 8 N, 127 E and 0.45 S, 133.5 E representing the intermediate waters of the MC and NGCUC are overlapped in (a) to represent the typical water masses from the North and South Pacific. NORTH EQUATORIAL CURRENT (noun) The noun NORTH EQUATORIAL CURRENT has 1 sense:. (a) Mean zonal Argo geostrophic currents vertically averaged between 240 and 340m in the tropical North Pacific Ocean. The rapid relative change in the coriolis parameter (a function of latitude) near the equator combined with the ITCZ being located north of the equator leads to similar rapid changes in the surface Ekman transport of the ocean and areas of convergence and divergence in the oceanic mixed layer. The NESC shows sizable seasonal-to-interannual variability and dominant westward propagation of the variability (Fig. 73(9), 13771416 (1992). https://doi.org/10.1002/2015JC011510 (2016). Thus, these largerandmore permanent currents contribute to making up the systems of currents which is known asgyres. An equatorial current is an oceanic currentwhich is flowing towards the west near the equator region. The Tertiary has five principal subdivisions, called Also, this NECC in the Atlantic completely stops blowing in the late winter and in the early spring. WebSynonyms for North Equatorial Current in Free Thesaurus. The Pacific North Equatorial Current is given a westward impetus by the Northeast Trade Winds (latitude 1025 N). J. Geophys. Res. The total transport in (a) and its interannual anomalies in (b) are further smoothed by 3 and 10 longitudinal moving averages, respectively. Let us know if you have suggestions to improve this article (requires login). This current is originated because of the Californian current and north-east monsoon. Figure 3. Despite this name, the North Equatorial Current is not accurately connected to the equator region. Salinity distributions (thin black contours with color shading) in meridional sections of 150 E (d), 165 W (e), and 130 W (f). Oceanogr. Majorly there are five gyres: TheNorth Atlantic Ocean current, the South Atlantic Ocean current, the North Pacific Ocean current, the South Pacific Ocean current, and the IndianOcean Gyre. WebIt is fed by the Canary Current and its waters eventually end up in the Gulf Stream system, either via the Antilles current or through the Caribbean via the Guiana current. The figure is generented by MATLAB software version R2019b (https://www.mathworks.com/). Western Australian Current. The successful simulations of the undercurrents by the LCSM, including the NESC, suggest that the undercurrents are generated by low baroclinic mode responses of the ocean circulation to the wind and wind curl forcing (Fig. True. They write new content and verify and edit content received from contributors. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Off the northeastern coast of South America, this current splits into the Caribbean Current, which passes into the Caribbean Sea and through the Yucatn Channel into the Gulf of Mexico, and into the Antilles. An important system of ocean currents that circulates water around the planet could significantly slow down or even stop completely in just a few decades, according to a shocking new study released Tuesday. The individual Argo temperature and salinity profiles in the NESC region are selected and downloaded at the Argo Data Management website https://www.argodatamgt.org/ for the water mass analyses. The IODs impacts on the major upper-ocean currents are also considerable, causing anomalies of 14 Sv (1 Sv 106 m3 s1) in the South Equatorial Current (SEC) and North Equatorial Countercurrent (NECC) volume transports. Limnol. The LCSM reproduces the main zonal currents of the mean surface circulation of the tropical Pacific Ocean successfully, using as few as 3 or 10 baroclinic modes (Fig. Jpn. The AMOC is a long current cycle A California CUrrent. The three-dimensional structure of the NESC has not been investigated systematically. The major zonal surface (North Equatorial Current, NEC; North Equatorial Countercurrent, NECC) and subsurface (NSCC; NESC) currents in the northern equatorial Pacific Ocean are marked in (bd). Variability of the NESC volume transport is investigated by integrating the zonal geostrophic currents between 200 and 600m in the latitudinal range of1.5 along the axis of the mean NESC (Methods) (Fig. Oceanogr. In this paper, we focus on the dynamics of the mean NESC. It transports warm water polewards. Thecurrentthat exists for the westward trade winds, which is in addition to the driving divergent of the westward surface flow (that the upwelling is the most intense at theequatorial region), also maintain a steady eastward pressure force that is by piling up the warm surface waters which are in the western side of the ocean basin. For example, during 2007/2008 and 2011/2012 La Nia events, the NESC transport anomalies were small, suggesting potential non-ENSO forcing of the interannual NESC, the dynamics of which need further investigation in a separate study. [5][6] While the SECC is geostrophic in nature, the physical mechanism for its appearance is less clear than with the NECC; that is, Sverdrup theory does not obviously explain its existence. The NEC is the broad westward flow that is the southern component of the N. Atlantic subtropical gyre. WebThe speed of these current varies based on the gyres, or currents that are kept in motion by prevailing winds. WebThe Canary Current is a wind-driven surface current that is part of the North Atlantic Gyre. & Gammon, R. H. The western equatorial Pacific: A water mass crossroads. Mean zonal Argo geostrophic currents in the meridional sections of (b) 150 E, (c) 165 E, and (d) 130 W in the western, central and eastern Pacific Ocean, respectively. They are located near the equator and are sandwiched between two westward-flowing currents, the North Equatorial Current and the South Equatorial Current. Visitors wear sun hats and carry umbrellas as they leave the Forbidden City on a hot day in Beijing, Thursday, June 29, 2023. 3a, b). 23, 517537 (1993). An ocean gyre is a large system of circular ocean currents formed by global wind patterns and forces created by Earths rotation. The simulated NESC locates just below the NECC, with the core velocity exceeding 2cms1 westward. Cold and Stable. This is the southern part of the clockwise subtropical gyre. The superposition of the first three scaled baroclinic mode functions shows the existence of undercurrents below the surface currents (Fig. No motionless level is assumed in the geostrophic current calculation. Squeezed between the equatorial currents is a well-defined countercurrent, the axis of which is always north of the Equator and which extends from the Philippines to the, is fed by the westward-flowing North Equatorial Current moving from North Africa to the West Indies. The water masses of the NESC appear to be the mixture of the North and South Pacific waters according to the TS relation of Argo profiles (Fig. 1bd, 3c), consistent with the latest shipboard ADCP measurements5, showing that the NESC is distinct from the intermediate current systems down below at the 1,000m Argo parking depth and at the deeper intermediate depths. TheEquatorial Counter Currentis another east-driven current. Sci Rep 10, 11758 (2020). The westward decrease of the NESC salinity between =26.5kgm3 and 27.0kgm3 suggests more contribution of the NPIW during the westward movement of the NESC. The 8-month long mooring observations at 4.7 N, 140 E in 2014 have showed the existence of the NESC based on time series current measurements for the first time6. The Wind, tides,creates differences in the temperatureandits salinity drive the ocean currents. 29.2) and reaches the Philippines Structure and dynamics of the Pacific North Equatorial Subsurface Current, https://doi.org/10.1038/s41598-020-68605-y. WebLocated at the crossroads of the tropical and subtropical circulations, the westward-flowing North Equatorial Current (NEC) and its subsequent bifurcation off the Philippine coast near 13N serve as important pathways for heat and water mass exchanges between the mid- and low-latitude North Pacific Ocean. The mooring data used in this study can be accessed at the web page https://itf.qdio.ac.cn/xzlxz/. The NESC is located between density layers of =26.0kgm3 and =27.0kgm3 (Fig.
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