Publications

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2024

Henderson LC, Wittmers F, Carlson CA, Worden AZ, Close HG (2024) Variable carbon isotope fractionation of photosynthetic communities over depth in an open-ocean euphotic zone. PNAS. DOI: 10.1073/pnas.2304613121.

2023

Wojtal PK, Doherty SC, Shea CH, Popp BN, Benitez-Nelson CR, Buesseler KO, Estapa ML, Roca-Martí M, Close HG (2023) Deconvolving mechanisms of particle flux attenuation using nitrogen isotope analyses of amino acids. Limnology and Oceanography. DOI: 10.1002/lno.12398.

Shea CH, Wojtal PK, Close HG, Stamieszkin K, Cope JS, Steinberg DJ, Maas AE, Wallsgrove N, Popp BN (2023) Small particles and heterotrophic protists support the mesopelagic zooplankton food web at Ocean Station Papa. Limnology and Oceanography. DOI: 10.1002/lno.12397.

Graff JR, Close HG, Siegel DA, and others (2023) Reconciliation of total particulate organic carbon and nitrogen measurements determined using contrasting methods in the North Pacific Ocean as part of the NASA EXPORTS field campaign. Elementa: Science of the Anthropocene. DOI: 10.1525/elementa.2022.00112.

2022

Motta LC, Blum JD, Popp BN, Umhau BP, Benitez-Nelson CR, Close HG, Washburn SJ, Drazen JC (2022) Mercury isotopic evidence shows that marine particles are an important source of mercury to marine organisms. Proceedings of the National Academy of Sciences of the USA, 119(44), 2208183119. DOI: 10.1073/pnas.2208183119.

2021

Siegel DA, and 73 others (2021) An operational overview of the EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) Northeast Pacific field deployment. Elementa: Science of the Anthropocene, 9(1): 00107. DOI: 10.1525/elementa.2020.00107.

Lohroff TJ, Gillette PR, Close HG, Benetti DD, Stieglitz JD (2021) Evaluating the potential bioextractive capacity of South Florida native macroalgae Agardhiella subulata for use in integrated multitrophic aquaculture (IMTA). Aquaculture, 544, 737091. DOI: 10.1016/j.aquaculture.2021.737091.

Vokhshoori NL, McCarthy MD, Close HG, Demopoulos AWJ, Prouty NG (2021) New geochemical tools for investigating resource and energy functions at deep-sea cold seeps using amino acid δ15N in chemosymbiotic mussels (Bathymodiolus childressi). Geobiology, 19(6), 601-617. DOI: 10.1111/gbi.12458.

Doherty SC, Maas AE, Steinberg DK, Popp BN, Close HG (2021) Distinguishing fecal pellets as a component of the biological pump using compound-specific isotope analysis of amino acids. Limnology and Oceanography, 66(7), 2827-2841. DOI: 10.1002/lno.11793.

Close HG, Lam PJ, Popp BN (2021) Marine Particle Chemistry: Influence on Biogeochemical Cycles and Particle Export. ACS Earth and Space Chemistry, 5(5), 1210-1211. DOI: 10.1021/acsearthspacechem.1c00091. [Editorial]

2020

Close HG, Henderson LC (2020) Open-ocean minima in δ13C values of particulate organic carbon in the lower euphotic zone. Frontiers in Marine Science, 7, 540165. DOI: 10.3389/fmars.2020.540165. This work is included as part of an e-book, "Current Topics in Marine Organic Biogeochemical Research, available at this link.

Romero-Romero S, Ka`apu-Lyons CK, Umhau BP, Benitez-Nelson CR, Hannides CCS,  Close HG, Drazen JC, Popp BN (2020) Deep zooplankton rely on small particles when particle fluxes are low. Limnology and Oceanography Letters. DOI: 10.1002/lol2.10163.  

Kharbush JJ, Close HG, Van Mooy BAS, Arnosti C, Smittenberg RH, Le Moigne FAC, Mollenhauer G, Scholz-Bottcher B, Obreht I, Koch BP, Becker K, Iversen MH, Mohr W (2020) Particulate organic carbon deconstructed: Molecular and chemical composition of particulate organic carbon in the ocean. Frontiers in Marine Science, 7, 518. DOI: 10.3389/fmars.2020.00518.  

Wang K, Close HG, Tuller-Ross B, Chen H (2020) Global average potassium isotope composition of modern seawater. ACS Earth and Space Chemistry, 4(7), 1010-1017. DOI: 10.1021/acsearthspacechem.0c00047.  

Motta LC, Blum JD, Popp BN, Drazen JC, Close HG (2020) Mercury stable isotopes in flying fish as a monitor of photochemical degradation of methylmercury in the Atlantic and Pacific Oceans. Marine Chemistry, 223, 103790. DOI: 10.1016/j.marchem.2020.103790.  

Prouty NG, Campbell-Swarzenski PL, Close HG, Biddle JF, Beckmann S (2020) Molecular indicators of methane metabolisms at cold seeps along the United States Atlantic Margin. Chemical Geology, 543, 119603. DOI: 10.1016/j.chemgeo.2020.119603.  

Hannides CCSH, Popp BN, Close HG, Benitez-Nelson CR, Kaʽapu-Lyons CA, Gloeckler K, Wallsgrove N, Umhau B, Drazen JC (2020) Seasonal dynamics of midwater zooplankton and relation to particle cycling in the North Pacific Subtropical Gyre. Progress in Oceanography, 182, 102266.  

2019

Umhau BP, Benitez-Nelson CR, Close HG, Hannides CCS, Motta L, Popp BN, Blum JD, Drazen JC (2019) Seasonal and spatial changes in carbon and nitrogen fluxes estimated using 234Th:238U disequilibria in the North Pacific tropical and subtropical gyre. Marine Chemistry, 217, 103705.
Hurley SJ, Close HG, Elling FJ, Jasper CE, Gospodinova K, McNichol AP, Pearson A (2019) CO2-dependent carbon isotope fractionation in Archaea, Part II: The marine water column. Geochimica et Cosmochimica Acta, 261, 383-395. 
Motta LC, Blum JD, Johnson MW, Umhau BP, Popp BN, Washburn SJ, Drazen JC, Benitez-Nelson CR, Hannides CCS, Close HG , Lamborg CH (2019) Mercury cycling in the North Pacific Subtropical Gyre as revealed by mercury stable isotope ratios. Global Biogeochemical Cycles, 33, 777-794. https://doi.org/10.1029/2018GB006057
Close HG (2019) Compound-Specific Isotope Geochemistry in the Ocean. Annual Review of Marine Science, 11, 27-56.   http://www.annualreviews.org/eprint/vmm9CCiqvvP5BfhKCU8i/full/10.1146/annurev-marine-121916-063634

2018

Gloeckler K, Choy CA, Hannides CCS, Close HG , Goetze E, Popp BN, Drazen JC (2018) Stable isotope analysis of micronekton around Hawaii reveals suspended particles are an important nutritional source in the lower mesopelagic and upper bathypelagic zones. Limnology and Oceanography, 63, 1168-1180. doi: 10.1002/lno.10762.
Hurley SJ, Lipp JS, Close HG , Hinrichs K-U, Pearson A (2018) Distribution and export of isoprenoid tetraether lipids in suspended particulate matter from the water column of the Western Atlantic Ocean. Organic Geochemistry, 116, 90-102.

2017

Ohkouchi N, Chikaraishi Y, Close HG , Fry B, Larsen T, Madigan DJ, McCarthy MD, McMahon KW, Nagata T, Naito YI, Ogawa NO, Popp BN, Steffan S, Takano Y, Tayasu I, Wyatt ASJ, Yamaguchi YT, Yokoyama Y (2017) Advances in the application of amino acid nitrogen isotopic analysis in ecological and biogeochemical studies. Organic Geochemistry, 113, 150-174.
Fassbender AJ & 73 others (2017) Perspectives on Chemical Oceanography in a changing environment: Participants of the COME ABOARD Meeting examine the field in the context of 40 years of DISCO. Marine Chemistry, 196, 181-190.
Jarman CL, Larsen T, Hunt T, Lipo C, Solsvik R, Wallsgrove N, Ka’apu-Lyons C, Close HG , Popp BN (2017) Diet of the prehistoric population of Rapa Nui (Easter Island, Chile) shows environmental adaptation and resilience. American Journal of Physical Anthropology, 164, 343-361.

Earlier

Close HG , Wakeham SG, Pearson A (2014) Lipid and 13C signatures of submicron and suspended particulate organic matter in the Eastern Tropical North Pacific: Implications for the contribution of Bacteria. Deep-Sea Research Part 1, 85, 15-34.
Close HG , Shah SR, Ingalls AE, Diefendorf AF, Brodie EL, Hansman RL, Freeman KH, Aluwihare LI, Pearson A (2013) Export of submicron particulate organic matter to mesopelagic depth in an oligotrophic gyre. Proceedings of the National Academy of Sciences of the USA, 110, 12565-12570. Cited for ASLO 2015 Lindeman Award
Close HG (2012) Size-related isotopic heterogeneity in lipids from the marine water column. Dissertation, Harvard University.
Close HG , Bovee R, Pearson A (2011) Inverse carbon isotope patterns of lipids and kerogen record heterogeneous primary biomass. Geobiology, 9, 250-265.
Pearson A, Leavitt WD, Saenz JP, Summons RE, Tam MC-M, Close HG (2009) Diversity of hopanoids and squalene-hopene cyclases across a tropical land-sea gradient. Environmental Microbiology, 11, 1208-1223.