|Home||<< 1 2 3 4 5 6 >>|
|Selman, C., & Misra, V. (2016). The sensitivity of southeastern United States climate to varying irrigation vigor. J. Geophys. Res. Atmos., 121(13), 7606–7621.|
Selph, K. E., Landry, M. R., Taylor, A. G., Gutierrez-Rodriguez, A., Stukel, M. R., Wokuluk, J., et al. (2016). Phytoplankton production and taxon-specific growth rates in the Costa Rica Dome. J Plankton Res, 38(2), 199–215.
Abstract: During summer 2010, we investigated phytoplankton production and growth rates at 19 stations in the eastern tropical Pacific, where winds and strong opposing currents generate the Costa Rica Dome (CRD), an open-ocean upwelling feature. Primary production (14C-incorporation) and group-specific growth and net growth rates (two-treatment seawater dilution method) were estimated from samples incubated in situ at eight depths. Our cruise coincided with a mild El Nino event, and only weak upwelling was observed in the CRD. Nevertheless, the highest phytoplankton abundances were found near the dome center. However, mixed-layer growth rates were lowest in the dome center ( approximately 0.5-0.9 day-1), but higher on the edge of the dome ( approximately 0.9-1.0 day-1) and in adjacent coastal waters (0.9-1.3 day-1). We found good agreement between independent methods to estimate growth rates. Mixed-layer growth rates of Prochlorococcus and Synechococcus were largely balanced by mortality, whereas eukaryotic phytoplankton showed positive net growth ( approximately 0.5-0.6 day-1), that is, growth available to support larger (mesozooplankton) consumer biomass. These are the first group-specific phytoplankton rate estimates in this region, and they demonstrate that integrated primary production is high, exceeding 1 g C m-2 day-1 on average, even during a period of reduced upwelling.
Keywords: Costa Rica Dome; growth; microzooplankton; mortality; phytoplankton
|Shropshire, T., Li, Y., & He, R. (2016). Storm impact on sea surface temperature and chlorophyll a in the Gulf of Mexico and Sargasso Sea based on daily cloud-free satellite data reconstructions. Geophys. Res. Lett., 43(23), 12,199–12,207.|
|Smith, S. R., Briggs, K., Lopez, N., & Kourafalou, V. (2016). Applying Automated Underway Ship Observations to Numerical Model Evaluation. J. Atmos. Oceanic Technol., 33(3), 409–428.|
|Smith, S. R., Lopez, N., & Bourassa, M. A. (2016). SAMOS air-sea fluxes: 2005-2014. Geosci. Data J., 3(1), 9–19.|
|Strazzo, S. E., Elsner, J. B., LaRow, T. E., Murakami, H., Wehner, M., & Zhao, M. (2016). The influence of model resolution on the simulated sensitivity of North Atlantic tropical cyclone maximum intensity to sea surface temperature. J. Adv. Model. Earth Syst., 8(3), 1037–1054.|
Stukel, M. R., Benitez-Nelson, C. R., Decima, M., Taylor, A. G., Buchwald, C., & Landry, M. R. (2016). The biological pump in the Costa Rica Dome: an open-ocean upwelling system with high new production and low export. J Plankton Res, 38(2), 348–365.
Abstract: The Costa Rica Dome is a picophytoplankton-dominated, open-ocean upwelling system in the Eastern Tropical Pacific that overlies the ocean's largest oxygen minimum zone. To investigate the efficiency of the biological pump in this unique area, we used shallow (90-150 m) drifting sediment traps and 234Th:238U deficiency measurements to determine export fluxes of carbon, nitrogen and phosphorus in sinking particles. Simultaneous measurements of nitrate uptake and shallow water nitrification allowed us to assess the equilibrium balance of new and export production over a monthly timescale. While f-ratios (new:total production) were reasonably high (0.36 +/- 0.12, mean +/- standard deviation), export efficiencies were considerably lower. Sediment traps suggested e-ratios (export/14C-primary production) at 90-100 m ranging from 0.053 to 0.067. ThE-ratios (234Th disequilibrium-derived export) ranged from 0.038 to 0.088. C:N and N:P stoichiometries of sinking material were both greater than canonical (Redfield) ratios or measured C:N of suspended particulates, and they increased with depth, suggesting that both nitrogen and phosphorus were preferentially remineralized from sinking particles. Our results are consistent with an ecosystem in which mesozooplankton play a major role in energy transfer to higher trophic levels but are relatively inefficient in mediating vertical carbon flux to depth, leading to an imbalance between new production and sinking flux.
Keywords: Eastern Tropical Pacific; biogeochemistry; carbon flux; nutrients; plankton
|Thoppil, P. G., Metzger, E. J., Hurlburt, H. E., Smedstad, O. M., & Ichikawa, H. (2016). The current system east of the Ryukyu Islands as revealed by a global ocean reanalysis. Progress in Oceanography, 141, 239–258.|
|Tseng, Y. -heng, Lin, H., Chen, H. -ching, Thompson, K., Bentsen, M., Böning, C. W., et al. (2016). North and equatorial Pacific Ocean circulation in the CORE-II hindcast simulations. Ocean Modelling, 104, 143–170.|
|Wdowinski, S., Bray, R., Kirtman, B. P., & Wu, Z. (2016). Increasing flooding hazard in coastal communities due to rising sea level: Case study of Miami Beach, Florida. Ocean & Coastal Management, 126, 1–8.|