Search Results - "Hain, Mathis P"

The polar ocean and glacial cycles in atmospheric CO2 concentration by Sigman, Daniel M., Hain, Mathis P., Haug, Gerald H.

“…Glacial cycles tracked The oscillations during the past 2.5 million years between ice ages and interglacials were probably triggered by orbital changes, but…”
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A 35-million-year record of seawater stable Sr isotopes reveals a fluctuating global carbon cycle by Paytan, Adina, Griffith, Elizabeth M, Eisenhauer, Anton, Hain, Mathis P, Wallmann, Klaus, Ridgwell, Andrew

“…Changes in the concentration and isotopic composition of the major constituents in seawater reflect changes in their sources and sinks. Because many of the…”
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Causes of ice age intensification across the Mid-Pleistocene Transition by Chalk, Thomas B., Hain, Mathis P., Foster, Gavin L., Rohling, Eelco J., Sexton, Philip F., Badger, Marcus P. S., Cherry, Soraya G., Hasenfratz, Adam P., Haug, Gerald H., Jaccard, Samuel L., Martínez-García, Alfredo, Pälike, Heiko, Pancost, Richard D., Wilson, Paul A.

“…During the Mid-Pleistocene Transition (MPT; 1,200–800 kya), Earth’s orbitally paced ice age cycles intensified, lengthened from ∼40,000 (∼40 ky) to ∼100 ky,…”
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Carbon dioxide effects of Antarctic stratification, North Atlantic Intermediate Water formation, and subantarctic nutrient drawdown during the last ice age: Diagnosis and synthesis in a geochemical box model by Hain, Mathis P., Sigman, Daniel M., Haug, Gerald H.

“…In a box model synthesis of Southern Ocean and North Atlantic mechanisms for lowering CO2 during ice ages, the CO2 changes are parsed into their component…”
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The impact of atmospheric pCO2 on carbon isotope ratios of the atmosphere and ocean by Galbraith, Eric D., Kwon, Eun Young, Bianchi, Daniele, Hain, Mathis P., Sarmiento, Jorge L.

“…It is well known that the equilibration timescale for the isotopic ratios 13C/12C and 14C/12C in the ocean mixed layer is on the order of a decade, 2 orders of…”
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Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles by Piccione, Gavin, Blackburn, Terrence, Tulaczyk, Slawek, Rasbury, E. Troy, Hain, Mathis P., Ibarra, Daniel E., Methner, Katharina, Tinglof, Chloe, Cheney, Brandon, Northrup, Paul, Licht, Kathy

“…Ice cores and offshore sedimentary records demonstrate enhanced ice loss along Antarctic coastal margins during millennial-scale warm intervals within the last…”
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Changes in North Atlantic nitrogen fixation controlled by ocean circulation by Straub, Marietta, Sigman, Daniel M., Ren, Haojia, Martínez-García, Alfredo, Meckler, A. Nele, Hain, Mathis P., Haug, Gerald H.

“…Reconstructed changes in North Atlantic nitrogen fixation over the past 160,000 years have a 23,000-year cycle that is interpreted to result from…”
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The silicon cycle impacted by past ice sheets by Hawkings, Jon R., Hatton, Jade E., Hendry, Katharine R., de Souza, Gregory F., Wadham, Jemma L., Ivanovic, Ruza, Kohler, Tyler J., Stibal, Marek, Beaton, Alexander, Lamarche-Gagnon, Guillaume, Tedstone, Andrew, Hain, Mathis P., Bagshaw, Elizabeth, Pike, Jennifer, Tranter, Martyn

“…Globally averaged riverine silicon (Si) concentrations and isotope composition (δ 30 Si) may be affected by the expansion and retreat of large ice sheets…”
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The dual isotopes of deep nitrate as a constraint on the cycle and budget of oceanic fixed nitrogen by Sigman, Daniel M., DiFiore, Peter J., Hain, Mathis P., Deutsch, Curtis, Wang, Yi, Karl, David M., Knapp, Angela N., Lehmann, Moritz F., Pantoja, Silvio

“…We compare the output of an 18-box geochemical model of the ocean with measurements to investigate the controls on both the mean values and variation of…”
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Shortcomings of the isolated abyssal reservoir model for deglacial radiocarbon changes in the mid-depth Indo-Pacific Ocean by Hain, Mathis P., Sigman, Daniel M., Haug, Gerald H.

“…Severely negative Δ14C anomalies from the mid‐depth Pacific and the Arabian Sea have been taken as support for the hypothesized deglacial release of a…”
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Sinking organic matter spreads the nitrogen isotope signal of pelagic denitrification in the North Pacific by Sigman, Daniel M., DiFiore, Peter J., Hain, Mathis P., Deutsch, Curtis, Karl, David M.

“…Culture studies of denitrifying bacteria predict that denitrification will generate equivalent gradients in the δ15N and δ18O of deep ocean nitrate. A depth…”
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North Atlantic ventilation of "southern-sourced" deep water in the glacial ocean by Kwon, Eun Young, Hain, Mathis P., Sigman, Daniel M., Galbraith, Eric D., Sarmiento, Jorge L., Toggweiler, J. R.

“…One potential mechanism for lowering atmospheric CO2 during glacial times is an increase in the fraction of the global ocean ventilated by the North Atlantic,…”
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The effects of secular calcium and magnesium concentration changes on the thermodynamics of seawater acid/base chemistry: Implications for Eocene and Cretaceous ocean carbon chemistry and buffering by Hain, Mathis P., Sigman, Daniel M., Higgins, John A., Haug, Gerald H.

“…Reconstructed changes in seawater calcium and magnesium concentration ([Ca2+], [Mg2+]) predictably affect the ocean's acid/base and carbon chemistry. Yet…”
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On the origin of the marine zinc–silicon correlation by de Souza, Gregory F., Khatiwala, Samar P., Hain, Mathis P., Little, Susan H., Vance, Derek

“…The close linear correlation between the distributions of dissolved zinc (Zn) and silicon (Si) in seawater has puzzled chemical oceanographers since its…”
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What drives the latitudinal gradient in open-ocean surface dissolved inorganic carbon concentration? by Wu, Yingxu, Hain, Mathis P, Humphreys, Matthew P, Hartman, Sue, Tyrrell, Toby

“…Previous work has not led to a clear understanding of the causes of spatial pattern in global surface ocean dissolved inorganic carbon (DIC), which generally…”
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Ocean Oxygen, Preformed Nutrients, and the Cause of the Lower Carbon Dioxide Concentration in the Atmosphere of the Last Glacial Maximum by Sigman, Daniel M., Hain, Mathis P.

“…All else equal, if the ocean's “biological [carbon] pump” strengthens, the dissolved oxygen (O2) content of the ocean interior declines. Confidence is now high…”
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Persistently well-ventilated intermediate-depth ocean through the last deglaciation by Chen, Tianyu, Robinson, Laura F., Burke, Andrea, Claxton, Louis, Hain, Mathis P., Li, Tao, Rae, James W. B., Stewart, Joseph, Knowles, Timothy D. J., Fornari, Daniel J., Harpp, Karen S.

“…During the last deglaciation (~18–11 thousand years ago), existing radiocarbon ( 14 C) reconstructions of intermediate waters in the mid- to low-latitude…”
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Analysis of global surface ocean alkalinity to determine controlling processes by Fry, Claudia H., Tyrrell, Toby, Hain, Mathis P., Bates, Nicholas R., Achterberg, Eric P.

“…The export of calcium carbonate (CaCO3) from the surface ocean is poorly constrained. A better understanding of the magnitude and spatial distribution of this…”
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Response to Comment by Zeebe and Tyrrell on “The Effects of Secular Calcium and Magnesium Concentration Changes on the Thermodynamics of Seawater Acid/Base Chemistry: Implications for the Eocene and Cretaceous Ocean Carbon Chemistry and Buffering” by Hain, Mathis P., Sigman, Daniel M., Higgins, John A., Haug, Gerald H.

“…Key Points Suspect parameters were changed to new reference The main results of original study hold true We demonstrate skill of MyAMI model, which is superior…”
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Anomalous > 2000‐Year‐Old Surface Ocean Radiocarbon Age as Evidence for Deglacial Geologic Carbon Release by Rafter, Patrick A., Carriquiry, José D., Herguera, Juan‐Carlos, Hain, Mathis P., Solomon, Evan A., Southon, John R.

“…Geologic carbon from seafloor volcanism may influence late Pleistocene glacial terminations by increasing the global inventory of the greenhouse gas CO2…”
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