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- Toward quantifying the response of the oceans' biological pump to climate change
- Quantification of ocean heat uptake from changes in atmospheric O2 and CO2 composition
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Toward quantifying the response of the oceans' biological pump to climate change
I, with the other co-authors of Resplandy et al , want to address two problems that came to our attention since publication of our paper in Nature last week. These problems do not invalidate the methodology or the new insights into ocean biogeochemistry on which it is based, but they do influence the mean rate of warming we infer, and more importantly, the uncertainties of that calculation. We would like to thank Nicholas Lewis for first bringing an apparent anomaly in the trend calculation to our attention. We quickly realized that our calculations incorrectly treated systematic errors in the O 2 measurements as if they were random errors in the error propagation. This led to under-reporting of the overall uncertainty and also caused the ocean heat uptake to be shifted high through the application of a weighted least squares fit. In addition, we realized that the uncertainties in the assumption of a constant land O 2 :C exchange ratio of 1.
Bowman, K. Global Biogeochemical Cycles. Hauck, J. Buesseler, K. High-resolution spatial and temporal measurements of particulate organic carbon flux using thorium in the northeast Pacific Ocean during the EXport Processes in the Ocean from RemoTe Sensing field campaign. Elementa: Science of the Anthropocene 8.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Resplandy and R. Keeling and Y.
Quantification of ocean heat uptake from changes in atmospheric O2 and CO2 composition
Metrics details. In this paper, our discussion is focused on the response of two major calcifiers, foraminifera and corals, which contribute much to the global carbonate burial rate. Photosymbiosis is regarded as an adaptive ecology for living in warm and oligotrophic oceans, especially for reef-building corals and larger reef-dwelling benthic foraminifera. As a consequence of global warming, bleaching may be a global threat to algal symbiont-bearing marine calcifying organisms under conditions of high temperature and light intensity. If CO 2 is dissolved in seawater, the partial pressure of CO 2 in seawater p CO 2 and dissolved inorganic carbon DIC increases while pH and the saturation state of carbonate minerals decreases without any change in total alkalinity. Generally, marine calcifying organisms show decreases in calcification rates in response to acidified seawater.
The oceans take up over 1 million tons of anthropogenic CO 2 per hour, increasing dissolved p CO 2 and decreasing seawater pH in a process called ocean acidification OA. At the same time greenhouse warming of the surface ocean results in enhanced stratification and shoaling of upper mixed layers, exposing photosynthetic organisms dwelling there to increased visible and UV radiation as well as to a decreased nutrient supply. In addition, ocean warming and anthropogenic eutrophication reduce the concentration of dissolved O 2 in seawater, contributing to the spread of hypoxic zones. All of these global changes interact to affect marine primary producers. Such interactions have been documented, but to a much smaller extent compared to the responses to each single driver. The combined effects could be synergistic, neutral, or antagonistic depending on species or the physiological processes involved as well as experimental setups. For most photosynthetic nitrogen fixers diazotrophs , acidification associated with elevated CO 2 may enhance their N 2 fixation activity, but interactions with other environmental variables such as trace metal availability may neutralize or even reverse these effects.
Effects of climate change across ocean regions View all 11 Articles. The biological pump makes a major global contribution to the sequestration of carbon-rich particles in the oceans' interior. This pump has many component parts from physics to ecology that together control its efficiency in exporting particles. Hence, the influence of climate change on the functioning and magnitude of the pump is likely to be complex and non-linear. Model simulations reveal that in the surface ocean, changes to algal community structure i.
A lot of interest in the new Resplandy et al paper WaPo , with some exploration of the implications on twitter i. Meanwhile, the CMIP6 model output is starting to come out…. Just read about this Quantification of ocean heat uptake from changes in atmospheric O2and CO2 composition in Nature by L. Resplandy et al. Would like to know what everyone thinks.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Resplandy and R. Keeling and Y. Eddebbar and M.
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Я думал, вы из городского… хотите заставить меня… - Он замолчал и как-то странно посмотрел на Беккера. - Если не по поводу колонки, то зачем вы пришли. Хороший вопрос, подумал Беккер, рисуя в воображении горы Смоки-Маунтинс.