Generation and propagation of anticyclonic rings in the Gulf of Papagayo

Ballestero, Daniel; Coen, J. E.

doi:10.1080/01431160310001642395

Cited by 25 publications

(21 citation statements)

References 6 publications

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“…This calculation confirms the notion that the intraseasonal fluctuations in temperature and dynamic height observed at the mooring are associated with westward propagating motions, and the estimated phase speed is consistent with the phase speed estimate made by inspection of Figure 9. The estimate is comparable to the phase speed estimates near 10°N made by Perigaud [1990] (14 cm/s) and Ballestero and Coen [2004] (12.6 cm/s), but it is somewhat less than the phase speed estimates reported by Giese et al [1994] (17 cm/s).…”

Section: Estimation Of Spatial Scales and Propagation Characteristicssupporting

confidence: 68%

“…We have not endeavored to determine whether the intraseasonal eddies observed at the eastern boundary are forced by the wind or are associated with retroflection, though there is substantial evidence for wind forced eddies [e.g., Stumpf and Legeckis , 1977; McCreary et al , 1989; Clarke , 1988] and the Gulf of Tehuantepec seems rather far from the NECC for retroflection to make sense as a generation mechanism there. Nonetheless, Ballestero and Coen [2004] have suggested that their observations near the Gulf of Papagayo are consistent with both interpretations.…”

Section: Resultsmentioning

confidence: 72%

“…However, except for the work of Miller et al [1985] and Perigaud [1990], these studies have not attempted to quantify the periodicity of the variability so it is not entirely clear whether all of these studies are relevant to the intraseasonal variability. The mountain gap winds at the gulfs of Tehuantepec and Papagayo are thought to force eddies that propagate westward (or southwestward) at speeds of about 13–17 cm/s [ Stumpf and Legeckis , 1977; Giese et al , 1994; Ballestero and Coen , 2004]. These eddies may be forced linearly by fluctuations in the strong mountain gap winds or nonlinearly by the annually varying winds that apply strong vorticity forcing [ Yamagata et al , 1990; Umatani and Yamagata , 1991].…”

Section: Introductionmentioning

confidence: 99%

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Intraseasonal variability near 10°N in the eastern tropical Pacific Ocean

Farrar¹,

Weller²

2006

J. Geophys. Res.

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[1] New in situ observations from 10°N, 125°W during 1997-1998 show strong intraseasonal variability in meridional velocity and sea surface temperature. The 50-to 100-day oscillations in sea surface height (SSH) have long been recognized as a prominent aspect of oceanic variability in the region of 9-13°N in the eastern Pacific Ocean. We use in situ and satellite data to more fully characterize this variability. The oscillations have zonal wavelengths of 550-1650 km and propagate westward in a manner consistent with the dispersion relation for first baroclinic mode, free Rossby waves in the presence of a mean westward flow. Analysis of 9 years of altimetry data shows that the amplitude of the 50-to 100-day SSH variability at 10°N is largest on 90-115°W, with peak amplitudes occurring around April. Some eddies traveling westward at 10-13°N emanate from near the gulfs of Tehuantepec and Papagayo, but eddies sometimes also appear to intensify well away from the coast while in the North Equatorial Current (NEC). The hypothesis that the intraseasonal variability and its annual cycle are associated with baroclinic instability of the NEC is supported by a spatiotemporal correlation between the amplitude of 50-to 100-day variability and the occurrence of westward zonal flows meeting an approximate necessary condition for baroclinic instability. The notion that baroclinic instability may be involved is further corroborated by the tendency of the NEC to weaken while the eddies intensify, even as the wind works to strengthen the current.

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Section: Estimation Of Spatial Scales and Propagation Characteristicssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Intraseasonal variability near 10°N in the eastern tropical Pacific Ocean

Farrar¹,

Weller²

2006

J. Geophys. Res.

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“…A full review through 2006 is provided by Willett, Leben & Lavín (2006). Using Lagrangian drifting buoys, local meteorological stations and Advanced very High Resolution Radiometer (AvHRR) imagery, Ballestero & Coen (2004) analyzed the generation and propagation of eddies in the Gulf of Papagayo. Their results agree with the previous findings, which suggest that the generation mechanisms are forcing by inertially rotating Papagayo winds and potential vorticity conservation in the Costa Rica Coastal Current.…”

Section: Ocean Eddiesmentioning

confidence: 99%

The easternmost tropical Pacific. Part II: Seasonal and intraseasonal modes of atmospheric variability

Amador

Durán-Quesada

Rivera

et al. 2016

RBT

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This is Part II of a two-part review about climate and climate variability focused on the Eastern Tropical Pacific (ETP) and the Caribbean Sea (CS). Both parts are aimed at providing oceanographers, marine biologists, and other ocean scientists, a guiding base for ocean-atmosphere interaction processes affecting the CS, the ETP, and the waters of Isla del Coco. Isla del Coco National Park is a Costa Rican World Heritage site. Part I analyzed the mean fields for both basins and a larger region covering 25º S -35º N, 20º W -130º W. Here we focus on a smaller area (65º W -95º W, 0º -20º N), as a complement to Part 1. Incoming solar radiation and surface energy fluxes reveal the complex nature of the ETP and CS for convective activity and precipitation on seasonal and intraseasonal time scales. Both regions are relevant as sources of evaporation and the associated moisture transport processes. The American Monsoon System influences the climate and climate variability of the ETP and CS, however, the precise way systems affect regional precipitation and transport of moisture, within the Intra Americas Sea (IAS) are not clear. Although the Caribbean Low-Level Jet (CLLJ) is known to act as a conveyor belt for moisture transport, intraseasonal and seasonal modes of the CLLJ and their interactions with other IAS systems, have to be further investigated. Trans-isthmic jets, exert a variable seasonal wind stress force over the ocean surface co-generating regions of great marine productivity. Isolated convection, the seasonal migration of the Intertropical Convergence Zone, the hurricane season, the Mid-Summer Drought, the seasonal and intraseasonal behavior of low-level jets and their interactions with transients, and the southward incursion of cold fronts contribute to regional seasonal precipitation. Many large-scale systems, such as El Niño-Southern Oscillation, the Atlantic Multidecadal Oscillation and the Madden-Julian Oscillation (MJO, also influence the variability of precipitation by modulating regional features associated with convection and precipitation. Monthly tropical storm (TS) activity in the CS and ETP basins is restricted to the period May-November, with very few cases in December. The CS presents TS peak activity during August, as well as for the number of hurricanes and major hurricanes, in contrast to the ETP that shows the same features during September. Rev. Biol. Trop. 64 (Suppl. 1): S23-S57. Epub 2016 Febrary 01.Key words: Cocos Island, Isla del Coco, seasonal and intraseasonal variability modes, Madden-Julian Oscillation, Caribbean Low-Level Jet, Chocó Jet, trans-isthmic low-level jets, atmospheric rivers.The Intra Americas Sea (IAS) is defined here as a region comprising the Gulf of Mexico (GM), the Caribbean Sea (CS), the Easternmost Tropical Pacific (ETP) and embedded continental areas. The dominant rain-producing systems of this tropical region are primarily convective in nature, however, their origin may be very broad. Convection may be the result of land and sea breeze processes, di...

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“…The strongest wind jets develop during the boreal winter (Amador et al, 2016) and are driven by large-scale variations of the trade winds (Chelton et al, 2000;Alfaro and Cortés, 2012). When Papagayo winds blow 5 through the mountain gap between southern Nicaragua and northern Costa Rica, the resulting strong offshore winds on the Pacific side lead to upwelling of cold and nutrient-enriched subsurface waters between December and April (McCreary et al, 1989;Brenes et al, 1990;Ballestero and Coen, 2004;Kessler, 2006;). These cyclonic eddies also influence the magnitude and location of the Costa Rica Dome (CRD), which is located ca.…”

Section: Study Sitementioning

confidence: 99%

Natural ocean acidification at Papagayo upwelling system (North Pacific Costa Rica): implications for reef development

Sánchez-Noguera¹,

Stuhldreier²,

Cortés³

et al. 2017

Preprint

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Abstract.Numerous experiments have shown that ocean acidification impedes coral calcification, but knowledge about in situ reef ecosystem response to ocean acidification is still scarce. Bahía Culebra, situated at the northern Pacific coast of Costa Rica, is a location naturally exposed to acidic conditions due to the Papagayo seasonal upwelling. We measured pH 15 and pCO2 in situ during two non-upwelling seasons (June 2012, May-June 2013, with a high temporal resolution of every 15 and 30 min, respectively, using two Submersible Autonomous Moored Instruments (SAMI-pH, SAMI-CO2). These results were compared with published data from the upwelling season 2009. Findings revealed that the carbonate system in Bahía Culebra shows a high temporal variability. Incoming offshore waters drive inter-and intra-seasonal changes. Lowest pH (7.8) and highest pCO2 (658.3 µatm) values measured during a cold-water intrusion event in the non-upwelling season were 20 similar to those minimum values reported from upwelling season (pH = 7.8, pCO2 = 643.5 µatm), unveiling that natural acidification occurs sporadically also in non-upwelling season. This affects the interaction of photosynthesis, respiration, calcification, and carbonate dissolution and the resulting diel cycle of pH and pCO2 in the reefs of Bahía Culebra. During non-upwelling season, the aragonite saturation state (Ωa) rises to values of >3.3 and enhances calcification. Aragonite saturation state values during upwelling season falls below 2.5, hampering calcification and coral growth. Low reef accretion 25 in Bahía Culebra indicates high erosion rates and that these reefs grow on the verge of their ecological tolerance. The Ωa threshold values for coral growth, derived from the correlation between Ωa and coral linear extension rates, suggest that future ocean acidification will threaten reefs in Bahía Culebra. These data contribute to build a better understanding of the carbonate system dynamics and coral reefs key response (e.g. coral growth) to natural low-pH conditions, in upwelling areas in the Eastern Tropical Pacific and beyond. 30Biogeosciences Discuss., https://doi

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Generation and propagation of anticyclonic rings in the Gulf of Papagayo

Cited by 25 publications

References 6 publications

Intraseasonal variability near 10°N in the eastern tropical Pacific Ocean

Intraseasonal variability near 10°N in the eastern tropical Pacific Ocean

The easternmost tropical Pacific. Part II: Seasonal and intraseasonal modes of atmospheric variability

Natural ocean acidification at Papagayo upwelling system (North Pacific Costa Rica): implications for reef development

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