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3 edition of Annual and longitudinal variations of the Pacific North equatorial countercurrent found in the catalog.

Annual and longitudinal variations of the Pacific North equatorial countercurrent

Annual and longitudinal variations of the Pacific North equatorial countercurrent

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Published by National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, National Technical Information Service, distributor in Pasadena, Calif, [Springfield, Va .
Written in English

    Subjects:
  • Oceanography.

  • Edition Notes

    StatementNina K. Lolk.
    Series[NASA contractor report] -- NASA CR-192805., NASA contractor report -- NASA CR-192805.
    ContributionsJet Propulsion Laboratory (U.S.)
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14690910M

      AN eastward-flowing current of speeds from 10 to 25 cm./sec. is indicated along a density surface (σt = ) in the Pacific Ocean south of the equator in a position roughly symmetrical to that. Ocean Circulation-On the map below, draw the major surface currents of the worlds oceans. Use the figure in your book if you need help. -Label the following currents and gyres on your map: Currents Gyres The California Current North Pacific The Kurashi ro Current South Pacific The Gulf Stream North File Size: KB.

    Current (NEC) is centered at 12°_13°N and the North Equatorial Countercurrent (NECC) at about 5°N similar to the U.S. Navy'sGDEM climatology (Teague et al, ) (Fig le). The Mindanao eddy is simulated east of the south Philippines coast. Figure 1b shows the annual mean SSH from the same global simulation for the western tropical by: 6. Other articles where Pacific North Equatorial Current is discussed: equatorial current: The Pacific North Equatorial Current is given a westward impetus by the Northeast Trade Winds (latitude 10°–25° N). Upon reaching the Philippines, the current divides, with the lesser part turning south and then east to start the Pacific Equatorial Countercurrent, and the greater part flowing north..

    s there have been in situ observations of Internal Solitary Waves (ISWs) near the North Equatorial Counter Current (NECC) off the Brazilian continental shelf, where localized surface velocity pulses of up to 2 m/s have been documented (e.g. Brandt et al., ). Despite these early efforts, the region remained largely unexplored until recently. The ocean and the world’s mean climate turbulence (Figures and ) and assists in l owering SST. Horizontal shear between the South Equatorial Current and the North Equatorial Countercurrent gives rise to wave-like instabilities in the central and eastern Pacific Ocean (Figure ). These waves are.


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Annual and longitudinal variations of the Pacific North equatorial countercurrent Download PDF EPUB FB2

Annual and Longitudinal Variations of the Pacific North Equatorial Countercurrent Nina K. Lolk Department of Atmospheric Sciences University of California, Los Angeles (NASA-CR) ANNUAL AND LC_WGITU_INAL VARIATIONS OF THE PACIFIC NCRTH EQUATOQIAL CCUNTERCURRENT (JPL) 22_p _;?Is-:/ G3/4_ N Unclas March I_IASA.

Get this from a library. Annual and longitudinal variations of the Pacific North equatorial countercurrent. [Nina K Lolk; Jet Propulsion Laboratory (U.S.)]. The climatological annual cycle of the Pacific North Equatorial Countercurrent (NECC) simulated by an ocean general circulation model (OGCM) was studied.

The longitudinal variation of transports, degree of geostrophy, and the relationship between Ekman pumping and vertical displacement of the thermocline were : Nina K. Lolk. Abstract Interannual and longer timescale variations of the North Equatorial Countercurrent (NECC) in the western Pacific are investigated using the multidecade (–) hindcast by the Ocean general circulation model for the Earth Simulator (OFES).

The OFES-simulated sea level and upper ocean circulation. The North Equatorial Countercurrent (NECC) is an important zonal flow in the upper circulation of the tropical Pacific Ocean, which plays a vital role in the heat budget of the western Pacific Cited by: 3.

Publications of the Jet Propulsion Laboratory J National Aeronautics and Annual and Longitudinal Variations of the Pacific North Equatorial Countercurrent, JPL PublicationMarch Lowe, S.

T.,File Size: 2MB. 1 Introduction. The North Equatorial Current (NEC) in the Pacific Ocean, as it encountering the Philippine coast, bifurcates into two western boundary currents (Figure 1): the northward flowing Kuroshio Current (KC) and the southward flowing Mindanao Current (MC) [Nitani, ; Toole et al., ; Hu and Cui, ; Qu and Lukas, ; Yaremchuk and Qu, ; Hu et al., ].Cited by: 5.

The CMODFD data were employed to compute the Ekman vertical velocity in the region of the Pacific North Equatorial Countercurrent (NECC), and a correlative relation was found between the annual cycles and longitudinal variations of the NECC and Ekman vertical motionAuthor: M.

Freilich, R. Dunbar and D. Halpern. Figures 1 and 2 provide elements for a first evaluation of near-equatorial currents and properties in the model, based on yr averages of the variables. The vertical and lateral velocity distributions exhibit the well-known jetlike structure of the EUC, located on average between and m depth and within ±° of the equator we observe an acceleration region west of Cited by:   The Equatorial Undercurrent (EUC) and North Equatorial Countercurrent (NECC) are major tropical ocean currents that transport warm water eastward in the uppermost – m.

The EUC and NECC occur at the equator and °N, respectively, with latitudinal widths of 3° Cited by: 2. Seasonal fluctuations of the surface North Equatorial Countercurrent (NECC) across the Pacific basin Yi-Chia Hsin1 and Bo Qiu1 Received 30 November ; revised 19 April ; accepted 20 April ; published 1 June [1] Based on multisatellite-derived.

La Nin˜a years. This variation is mainly accounted for by westward propagation of upwelling (downwelling) Rossby waves generated by winds in the central equatorial Pacific and by an anomalous anticyclone (cyclone) located in the western North Pacific when a warm (cold) event matures.

The interannual variability of the NEC transport is. The annual and interannual variations of the major zonal currents of the central tropical Pacific for the period are described by analyzing two data sets: sea level data from a few selected island stations and ship-of-opportunity expendable bathythermograph (XBT) observations.

The annual cycles of geostrophic surface current indices (dynamic height or sea level difference between the Cited by: The climatological annual cycle of the Pacific North Equatorial Countercurrent (NECC) simulated by an ocean general circulation model (OGCM) was studied.

The longitudinal variation of transports. Monthly period oscillations in temperature and velocity in the vicinity of the North Equatorial Countercurrent along °W are examined using moored time series data collected during – These oscillations, which presumably derive their energy from instability of the large‐scale shear of the zonal equatorial current system, are Cited by: The climatological annual cycle of the Pacific North Equatorial Countercurrent (NECC) simulated by an ocean general circulation model (OGCM) was studied.

Decadal variations of the transport and bifurcation latitude of the North Equatorial Current (NEC) in the northwestern tropical Pacific Ocean over – are investigated using outputs of the Ocean Analysis/Reanalysis System 3 prepared by the European Centre for Medium-Range Weather Forecasts.

The results indicate that the NEC transports at different longitudes have different Cited by: 2. The change in the winds generated an eastward equatorial jet in the ocean and strengthened the eastward North Equatorial Countercurrent in the western Pacific (Meyers and Donguy, ). The equatorial jet reached °W by October (Firing et al., ).

KEYWORDS: Subtropical Countercurrent, Hawaiian Lee Countercurrent, Baroclinic instability, Mesoscale eddy, Altimeter observations Citation: Kobashi, F., and H. Kawamura, Seasonal variation and instability nature of the North Pacific Subtropical Countercurrent and the Hawaiian Lee Countercurrent, J.

In the North Pacific Equatorial Countercurrent and Equatorial Divergence region, values are higher around – mg m −3.

North to about 30°N, chlorophyll-a increases abruptly to over mg m −3. The Transition Zone and Subarctic Gyres show intermediate (– mg m −3) levels of annual maximum values.

The Western Subarctic Gyre Cited by:. of the Equatorial Undercurrent in the Western Atlantic. Oceanologica Acta, 4: Khanaichenko, N.K., Confirmation of the existence of the south branch of the Equatorial Countercurrent in the Atlantic Ocean.

Dokl. USSR Acad. Sci. Earth Sci. Soc. Khanaichenkot-N%rT7‘ Size: KB.The Pacific Equatorial Countercurrent is very strong and is definable year-round. The Atlantic Equatorial Countercurrent is strongest off the coast of Ghana (Africa), where it is known as the Guinea Current.

The countercurrent of the Indian Ocean flows only during the northern winter and only south Read More; Pacific North Equatorial Current.in the Western Tropical Pacific Ocean (January -January ) and Brian A. King: Preliminary Results from Charles Darwin Cruise 34A in the Western Equatorial Pacific Warren B.

White,Nicholas Graham. and Chang-KouTai: Reflection of Annual Rossby Waves at The Maritime Western Boundary ofthe Tropical.