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| Format: | Artículo científico |
| Langue: | en |
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Universidad Autónoma de Baja California
2017
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=48052975001 |
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- Temporal variations of water pCO2 and the air–water CO2 flux at a coastal location in the southern California Current System: diurnal to interannual scales Luz de Lourdes Aurora Coronado-Álvarez Saúl Álvarez-Borrego José Rubén Lara-Lara Elena Solana-Arellano José Martín Hernández-Ayón Alberto Zirino Ciencias de la Tierra CO2 air water flux coastal zone CO2 partial pressure California Current System The aim of this work was to identify processes that cause surface CO2 partial pressure (pCO2W) and air–water CO2 flux (FCO2) variations at a coastal location in the California Current System, from semidiurnal to interannual time scales. Such processes may include sea breeze, upwelling, El Niño/Southern Oscillation (ENSO) cycle, and “The Blob” (strong positive temperature anomalies in the NE Pacific). Sea surface temperature (SST, 2008–2014) and pCO2W (2008–2015) time series were generated with data collected from a MAPCO2 buoy anchored at 100 m depth and 5 km from Punta Banda (31.6ºN, 116.6ºW), Baja California, México. There were significant changes in SST, pCO2W, and FCO2 that lasted periods that were as short as a few hours and as large as interannual time frames. Spectral analysis showed significant semidiurnal, diurnal, ~15-d, and ~28-d components of variation. Time series were divided into periods according to the Multivariate ENSO Index and the Blob event. Bayesian t tests show that both pCO2W and FCO2 had high credibility of being different between periods. During La Niña conditions (2010–2011), maximum pCO2W and FCO2 values were higher, and the minimum values were lower, than during “normal,” El Niño, and Blob conditions. The pCO2W range during this La Niña event was from 131 to 864 atm, and the FCO2 range was from –6.9 to 40.4 mmol C·m–2·d–1. The FCO2 range during the Blob was from near equilibrium to ~2.5 mmol C·m–2·d–1. The extreme values for the FCO2 integral (± standard error), for all periods, were –57.0 ± 0.01 mmol C·m–2 for El Niño, and 257.0 ± 0.03 mmol C·m–2 for La Niña. The mean FCO2 value (± standard error) was 0.04 ± 0.02 mol C·m–2·yr–1. The buoy location was found to be a very weak source of CO2 during the study period. 2017 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48052975001 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.3 Vol.43