Climate and land use models predict that tropical deforestation and conversion to cropland will produce a large flux of soil carbon (C) to the atmosphere from accelerated decomposition of soil organic matter (SOM). However, the C flux from the deep tropical soils on which most intensive crop agriculture is now expanding remains poorly constrained. To quantify the effect of intensive agriculture on tropical soil C, we compared C stocks, radiocarbon, and stable C isotopes to 2 m depth from forests and soybean cropland created from former pasture in Mato Grosso, Brazil. We hypothesized that soil disturbance, higher soil temperatures (+2°C), and lower OM inputs from soybeans would increase soil C turnover and deplete C stocks relative to nearby forest soils. However, we found reduced C concentrations and stocks only in surface soils (0–10 cm) of soybean cropland compared with forests, and these differences could be explained by soil mixing during plowing. The amount and Δ14C of respired CO2 to 50 cm depth were significantly lower from soybean soils, yet CO2 production at 2 m deep was low in both forest and soybean soils. Mean surface soil δ13C decreased by 0.5‰ between 2009 and 2013 in soybean cropland, suggesting low OM inputs from soybeans. Together these findings suggest the following: (1) soil C is relatively resistant to changes in land use and (2) conversion to cropland caused a small, measurable reduction in the fast‐cycling C pool through reduced OM inputs, mobilization of older C from soil mixing, and/or destabilization of SOM in surface soils.
Ran, Jiangjun; Vizcaino, Miren; Ditmar, Pavel; van de Broeke, Michiel R.; Moon, Twila; Steger, Christian R.; Enderlin, Ellyn M.; Wouter, Bert; Noël, Brice; Reijmer, Catharina H.; Klees, Roland; Zhong, Min; Liu, Lin; Fettweis, Xavier;
Published Date:
2018
Source:
The Cryosphere, 12, 2981–2999, 2018
Description:
The Greenland Ice Sheet (GrIS) is currently losing ice mass. In order to accurately predict future sea level rise, the mechanisms driving the observed mass loss must be better understood. Here, we combine data from the satellite gravimetry mission Gr...
In the 1970s, the introduced silver carp Hypophthalmichthys molitrix (which is indigenous to eastern Asia) escaped from southern U.S. aquaculture to spread throughout the Mississippi River basin, and since has steadily moved northward. This large, pr...
Using observational data and phase 5 of the Coupled Model Intercomparison Project (CMIP5) model outputs [the preindustrial (PI) control run of the Community Climate System Model, version 4 (CCSM4) and historical simulations of 17 CMIP5 models], India...
Ecosystem services (ES) practitioners (e.g., researchers, policy makers) have been working to better define, measure, and value the ways that nature contributes to society. Because measurement techniques follow the labeling or identification of ES, p...
Williamson, Andrew G.; Banwell, Alison F.; Willis, Ian C.; Arnold, Neil S.;
Published Date:
2018
Source:
The Cryosphere, 12, 3045–3065, 2018
Description:
Remote sensing is commonly used to monitor supraglacial lakes on the Greenland Ice Sheet (GrIS); however, most satellite records must trade off higher spatial resolution for higher temporal resolution (e.g. MODIS) or vice versa (e.g. Landsat). Here, ...
Wadhams, P.; Aulicino, G.; Parmiggiani, F.; Persson, P. O. G.; Holt, B.;
Published Date:
2018
Source:
JGR Oceans 123(3): 2213-2237, 2018
Description:
The early autumn voyage of RV Sikuliaq to the southern Beaufort Sea in 2015 offered very favorable opportunities for observing the properties and thicknesses of frazil‐pancake ice types. The operational region was overlaid by a dense network of ret...
Gray, Harrison J.; Tucker, Gregory E.; Mahan, Shannon A.;
Published Date:
2019
Source:
Reviews of Geophysics, 57(3), 987-1017
Description:
Luminescence holds unique potential as a sediment tracer and provenance method. The tracer application of luminescence has key advantages including ease of measurement, relatively low cost, and applicability to geologically ubiquitous quartz and feld...
Morrison, A. L.; Kay, J. E.; Chepfer, H.; Guzman, R.; Yettella, V.;
Published Date:
2018
Source:
JGR Atmospheres 123(1):473-490, 2018
Description:
While the radiative influence of clouds on Arctic sea ice is known, the influence of sea ice cover on Arctic clouds is challenging to detect, separate from atmospheric circulation, and attribute to human activities. Providing observational constraint...
Goodkin, N. F.; Bolton, A.; Hughen, K. A.; Karnauskas, K. B.; Griffin, S.; Phan, K. H.; Vo, S. T.; Ong, M. R.; Druffel, E. R. M.;
Published Date:
2019
Source:
Geophysical Resource Letters 46(9), 4790-4798
Description:
The East Asian Monsoon (EAM) impacts storms, freshwater availability, wind energy production, coal consumption, and subsequent air quality for billions of people across Asia. Despite its importance, the EAM's long‐term behavior is poorly understood...
Hamlington, Benjamin D.; Fasullo, John T.; Nerem, R. Steven; Kim, Kwang-Yul; Landerer, F. W.;
Published Date:
2019
Source:
Geophysical Research Letters, 46(9), 4844-4853
Description:
The continuous and near‐global coverage of satellite altimeters has provided an improved understanding of sea level rise on both global and regional scales. With its relatively short record, however, questions have persisted regarding how well sate...
Hurteau, Matthew D.; Liang, Shuang; Westerling, A. LeRoy; Wiedinmyer, Christine;
Published Date:
2019
Source:
Scientific Reports, 9(1), 2838
Description:
Climate influences vegetation directly and through climate-mediated disturbance processes, such as wildfire. Temperature and area burned are positively associated, conditional on availability of vegetation to burn. Fire is a self-limiting process tha...
Martin, N. J.; Conroy, J. L.; Noone, D.; Cobb, K. M.; Konecky, B. L.; Rea, S.;
Published Date:
2018
Source:
JGR Atmospheres 123(1):261-275, 2018
Description:
The origin of stable isotopic variability in precipitation over time and space is critical to the interpretation of stable isotope‐based paleoclimate proxies. In the eastern equatorial Pacific, modern stable isotope measurements in precipitation (...
Nathan, B. J.; Lauvaux, T.; Turnbull, J. C.; Richardson, S. J.; Miles, N. L.; Gurney, K. R.;
Published Date:
2018
Source:
JGR Atmospheres 123(12): 13611-13621, 2018
Description:
We assimilate multiple trace gas species within a single high‐resolution Bayesian inversion system to optimize CO2ff emissions for individual source sectors. Starting with carbon monoxide (CO), an atmospheric trace gas with fairly well‐known emis...
This paper is focusing on the representativeness of single lidar stations for zonally averaged ozone profile variations over the middle and upper stratosphere. From the lower to the upper stratosphere, ozone profiles from single or grouped lidar stat...
Shobe, Charles M.; Tucker, Gergory E.; Rossi, Matthew W.;
Published Date:
2018
Source:
JGR Earth Surface 123(8): 1931-1957
Description:
Geomorphologists often rely on simple models of river channel incision for predicting rates of landscape evolution and channel response to perturbations, as well as extracting climatic and tectonic signals from river longitudinal profiles. Recent wor...
Scambos, T. A.; Campbell, G. G.; Pope, A.; Haran, T.; Muto, A.; Lazzara, M.; Reijmer, C. H.; Van den Broeke, M. R.;
Published Date:
2018
Source:
Geophysical Research Letters 45(12): 6124-6133, 2018
Description:
We identify areas near the East Antarctic ice divide where <−90 °C surface snow temperatures are observed in wintertime satellite thermal‐band data under clear‐sky conditions. The lowest temperatures are found in small (<200 km2) topographic b...
O'Dell, C. W.; Eldering, A.; Wennberg, P. O.; Crisp, D.; Gunson, M. R.; Fisher, B.; Frankenberg, C.; Kiel, M.; Lindqvist, H.; Mandrake, L.; Merrelli, A.; Natraj, V.; Nelson, R. R.; Osterman, G. B.; Payne, V. H.; Taylor, T. E.; Wunch, D.; Drouin, B. J.; Oyafuso, F.; Chang, A.; McDuffie, J.; Smyth, M.; Baker, D. F.; Basu, S.; Chevallier, F.; Crowell, S. M. R.; Feng, L.; Palmer, P. I.; Dubey, M.; García, O. E.; Griffith, D. W. T.; Hase, F.; Iraci, L. T.; Kivi, R.; Morino, I.; Notholt, J.; Ohyama, H.; Petri, C.; Roehl, C. M.; Sha, M. K.; Strong, K.; Sussmann, R.; Te, Y.; Uchino, O.; Velazco, V. A.;
Published Date:
2018
Source:
Atmos. Meas. Tech., 11, 6539–6576, 2018
Description:
Since September 2014, NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite has been taking measurements of reflected solar spectra and using them to infer atmospheric carbon dioxide levels. This work provides details of the OCO-2 retrieval algorith...
Papanastasiou, Dimitrios K.; Beltrone, Allison; Marshall, Paul; Burkholder, James B.;
Published Date:
2018
Source:
Atmos. Chem. Phys., 18, 6317–6330, 2018
Description:
Hydrochlorofluorocarbons (HCFCs) are ozone depleting substances and potent greenhouse gases that are controlled under the Montreal Protocol. However, the majority of the 274 HCFCs included in Annex C of the protocol do not have reported global warmin...
Conkling, M.; Hesp, K.; Munroe, S.; Sandoval, K.; Martens, D. E.; Sipkema, D.; Wijffels, R. H.; Pomponi, S. A.;
Published Date:
2019
Source:
Scientific Reports, 9(1)
Description:
Sponges (Phylum Porifera) are among the oldest Metazoa and considered critical to understanding animal evolution and development. They are also the most prolific source of marine-derived chemicals with pharmaceutical relevance. Cell lines are importa...
One of the largest sources of uncertainty in sea level rise prediction is glacial acceleration, of which the surge phenomenon is the least understood type. The surge of the Bering Bagley Glacier System (BBGS), Alaska, in 2011–2013 has provided a ra...
White, Meredith M.; Waller, Jesica D.; Lubelczyk, Laura C.; Drapeau, David T.; Bowler, Bruce C.; Balch, William M.; Fields, David P.;
Published Date:
2018
Source:
Scientific Reports 8 (9758)
Description:
The most common biomineral produced in the contemporary ocean is calcium carbonate, including the polymorph calcite produced by coccolithophores. The surface waters of the ocean are supersaturated with respect to calcium carbonate. As a result, parti...
Bastida, F.; García, C.; Fierer, N.; Eldridge, D. J.; Bowker, M. A.; Abades, S.; Alfaro, F. D.; Asefaw Berhe, A.; Cutler, N. A.; Gallardo, A.; García-Velázquez, L.; Hart, S. C.; Hayes, P. E.; Hernández, T.; Hseu, Z.-Y.; Jehmlich, N.; Kirchmair, M.; Lambers, H.; Neuhauser, S.; Peña-Ramírez, V. M.; Pérez, C. A.; Reed, S. C.; Santos, F.; Siebe, C.; Sullivan, B. W.; Trivedi, P.; Vera, A.; Williams, M. A.; Luis Moreno, J.; Delgado-Baquerizo, M.;
Published Date:
2019
Source:
Nature Communications, 10(1)
Description:
Identifying the global drivers of soil priming is essential to understanding C cycling in terrestrial ecosystems. We conducted a survey of soils across 86 globally-distributed locations, spanning a wide range of climates, biotic communities, and soil...
Friedlingstein, P.; O'Sullivan, M.; Jones, M. W.; Andrew, R. M.; Hauck, J.; Olsen, A.; Peters, G. P.; Peters, W.; Pongratz, J.; Sitch, S.; Le Quéré, C.; Canadell, J. G.; Ciais, P.; Jackson, R. B.; Alin, S.; Aragão, L. E. O. C.; Arneth, A.; Arora, V.; Bates, N. R.; Becker, M.; Benoit-Cattin, A.; Bittig, H. C.; Bopp, L.; Bultan, S.; Chandra, N.; Chevallier, F.; Chini, L. P.; Evans, W.; Florentie, L.; Forster, P. M.; Gasser, T.; Gehlen, M.; Gilfillan, D.; Gkritzalis, T.; Gregor, L.; Gruber, N.; Harris, I.; Hartung, K.; Haverd, V.; Houghton, R. A.; Ilyina, T.; Jain, A. K.; Joetzjer, E.; Kadono, K.; Kato, E.; Kitidis, V.; Korsbakken, J. I.; Landschützer, P.; Lefèvre, N.; Lenton, A.; Lienert, S.; Liu, Z.; Lombardozzi, D.; Marland, G.; Metzl, N.; Munro, D. R.; Nabel, J. E. M. S.; Nakaoka, S. I.; Niwa, Y.; O'Brien, K.; Ono, T.; Palmer, P. I.; Pierrot, D.; Poulter, B.; Resplandy, L.; Robertson, E.; Rödenbeck, C.; Schwinger, J.; Séférian, R.; Skjelvan, I.; Smith, A. J. P.; Sutton, A. J.; Tanhua, T.; Tans, P. P.; Tian, H.; Tilbrook, B.; van der Werf, G.; Vuichard, N.; Walker, A. P.; Wanninkhof, R.; Watson, A. J.; Willis, D.; Wiltshire, A. J.; Yuan, W.; Yue, X.; Zaehle, S.;
Published Date:
2020
Source:
Earth System Science Data, 12(4)
Description:
Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate – the “global carbon budget” – is important to better understand the glo...