Western Geographic Science Center

Publications

Filter Total Items: 386
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Year Published: 2018

Uncertainty in United States coastal wetland greenhouse gas inventorying

Coastal wetlands store carbon dioxide (CO2) and emit CO2 and methane (CH4) making them an important part of greenhouse gas (GHG) inventorying. In the contiguous United States (CONUS), a coastal wetland inventory was recently calculated by combining maps of wetland type and change with soil, biomass, and CH4 flux data from a literature...

James Holmquist; Windham-Myers, Lisamarie; Blanca Bernal; Byrd, Kristin B.; Steve Crooks; Gonneea Eagle, Meagan; Nathan Herold; Sara Knox; Kroeger, Kevin D.; John McCombs; J. Patrick Megonigal; Lu Meng; James Morris; Ariana Sutton-Grier; Tiffany Troxler; Donald Weller

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Year Published: 2018

A 30-m landsat-derived cropland extent product of Australia and China using random forest machine learning algorithm on Google Earth Engine cloud computing platform

Mapping high resolution (30-m or better) cropland extent over very large areas such as continents or large countries or regions accurately, precisely, repeatedly, and rapidly is of great importance for addressing the global food and water security challenges. Such cropland extent products capture individual farm fields, small or large, and are...

Teluguntla, Pardhasaradhi; Thenkabail, Prasad S.; Oliphant, Adam; Xiong, Jun N.; Gumma, Murali Krishna; Congalton, Russell G.; Yadav, Kamini; Huete, Alfredo

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Year Published: 2018

Actinorhizal species influence plant and soil nitrogen status of semiarid shrub-dominated ecosystems in the western Great Basin, USA

Actinorhizal plants form symbiotic root associations with dinitrogen (N2) fixing Frankia and are abundant in North American cold deserts. However, the extent to which actinorhizal species are actively fixing N2 or altering ecosystem nitrogen (N) availability remains unclear. We used the 15N natural abundance...

Freund, Stephanie M.; Soper, Fiona M.; Poulson, Simon R.; Selmants, Paul C.; Sullivan, Benjamin W.
Freund S.M., Soper F.M., Poulson S.R., Selmants P.C., and Sullivan B.W. 2018. Actinorhizal species influence plant and soil nitrogen status of semiarid shrub-dominated ecosystems in the western Great Basin, USA. Journal of Arid Environments 157:48-56

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Year Published: 2018

Landsat time series analysis of fractional plant cover changes on abandoned energy development sites

Oil and natural gas development in the western United States has increased substantially in recent decades as technological advances like horizontal drilling and hydraulic fracturing have made extraction more commercially viable. Oil and gas pads are often developed for production, and then capped, reclaimed, and left to recover when no longer...

Waller, Eric K.; Villarreal, Miguel L.; Poitras, Travis B.; Nauman, Travis W.; Duniway, Michael C.
Waller, E.K., Villarreal, M.L., Poitras, T.B., Nauman, T.W., Duniway, M.C. 2018. Landsat time series analysis of fractional plant cover changes on abandoned energy development sites. International Journal of Applied Earth Observation and Geoinformation 73, 407-419, https://doi.org/10.1016/j.jag.2018.07.008

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Year Published: 2018

Adaptation with climate uncertainty: An examination of agricultural land use in the United States

This paper examines adaptation responses to climate change through adjustment of agricultural land use. The climate drivers we examine are changes in long-term climate normals (e.g., 10-year moving averages) and changes in inter-annual climate variability. Using US county level data over 1982 to 2012 from Census of Agriculture, we find that...

Mu, Jianhong E.; McCarl, Bruce A.; Sleeter, Benjamin M.; Abatzoglou, John T.; Zhang, Hongliang
Mu, J. E.; B.A. McCarl; B.M. Sleeter; J.T. Abatzoglou and H. Zhang. 2018. Adaptation with Climate Uncertainty: An Examination of Agricultural Land Use in the United States. Land Use Policy.

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Year Published: 2018

Mapping cropland fallow areas in myanmar to scale up sustainable intensification of pulse crops in the farming system

Cropland fallows are the next best-bet for intensification and extensification, leading to increased food production and adding to the nutritional basket. The agronomical suitability of these lands can decide the extent of usage of these lands. Myanmar’s agricultural land (over 13.8 Mha) has the potential to expand by another 50% into additional...

Gumma, Murali Krishna; Thenkabail, Prasad S.; Deevi, Kumara Charyulu; Mohammed, Irshad A.; Teluguntla, Pardhasaradhi; Oliphant, Adam; Xiong, Jun N.; Aye, Tin; Whittbread, Anthony M.

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Year Published: 2018

Remote sensing analysis of vegetation at the San Carlos Apache Reservation, Arizona and surrounding area

Mapping of vegetation types is of great importance to the San Carlos Apache Tribe and their management of forestry and fire fuels. Various remote sensing techniques were applied to classify multitemporal Landsat 8 satellite data, vegetation index, and digital elevation model data. A multitiered unsupervised classification generated over 900...

Norman, Laura M.; Middleton, Barry R.; Wilson, Natalie R.
Norman, L. M., Middleton, B. R., & Wilson, N. R. (2018). Remote sensing analysis of vegetation at the San Carlos Apache Reservation, Arizona and surrounding area. Journal of Applied Remote Sensing, 12(02), 1. https://doi.org/10.1117/1.JRS.12.026017

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Year Published: 2018

Clusters of community exposure to coastal flooding hazards based on storm and sea level rise scenarios—implications for adaptation networks in the San Francisco Bay region

Sea level is projected to rise over the coming decades, further increasing the extent of flooding hazards in coastal communities. Efforts to address potential impacts from climate-driven coastal hazards have called for collaboration among communities to strengthen the application of best practices. However, communities currently lack practical...

Hummel, Michelle; Wood, Nathan J.; Schweikert, Amy; Stacey, Mark T.; Jones, Jeanne; Barnard, Patrick L.; Erikson, Li H.
Hummel M, Wood N, Schweikert A, Stacey M, Jones J, Barnard P, Erikson L, 2017, Clusters of community exposure to coastal flooding hazards based on storm and sea level rise scenarios--implications for adaptation networks in the San Francisco Bay region, Regional Environmental Change. DOI: https://doi.org/10.1007/s10113-017-1267-5

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Year Published: 2018

Pedestrian evacuation modeling to reduce vehicle use for distant tsunami evacuations in Hawaiʻi

Tsunami waves that arrive hours after generation elsewhere pose logistical challenges to emergency managers due to the perceived abundance of time and inclination of evacuees to use vehicles. We use coastal communities on the island of Oʻahu (Hawaiʻi, USA) to demonstrate regional evacuation modeling that can identify where successful pedestrian-...

Wood, Nathan J.; Jones, Jamie; Peters, Jeff; Richards, Kevin
Wood N, Jones J, Peters J, Richards K, 2018, Pedestrian-evacuation modeling to reduce vehicle use for distant tsunami evacuations in Hawai'i: International Journal of Disaster Risk Reduction, v. 28, p. 271–283, https://doi.org/10.1016/j.ijdrr.2018.03.009.

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Year Published: 2018

Urban growth and landscape connectivity threats assessment at Saguaro National Park, Arizona, USA

Urban and exurban expansion results in habitat and biodiversity loss globally. We hypothesize that a coupled-model approach could connect urban planning for future cities with landscape ecology to consider wildland habitat connectivity. Our work combines urban growth simulations with models of wildlife corridors to examine how species will be...

Perkl, Ryan; Norman, Laura M.; Mitchell, David; Feller, Mark R.; Smith, Garrett; Wilson, Natalie R.
Perkl, R., Norman, L. M., Mitchell, D., Feller, M., Smith, G., & Wilson, N. R. (2018). Urban Growth and Connectivity Threats Assessment at Saguaro National Park, Arizona, USA. Journal of Land Use Science. https://doi.org/10.1080/1747423X.2018.1455905

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Year Published: 2018

A remote sensing-based model of tidal marsh aboveground carbon stocks for the conterminous United States

Remote sensing based maps of tidal marshes, both of their extents and carbon stocks, have the potential to play a key role in conducting greenhouse gas inventories and implementing climate mitigation policies. Our objective was to generate a single remote sensing model of tidal marsh aboveground biomass and carbon that represents nationally...

Byrd, Kristin B.; Ballanti, Laurel; Thomas, Nathan; Nguyen, Dung; Holmquist, James R.; Simard, Marc; Windham-Myers, Lisamarie
Byrd, K.B., L.R. Ballanti, N. Thomas, D. Nguyen, J. Holmquist, M. Simard, and L. Windham-Myers. 2018. A remote sensing-based model of tidal marsh aboveground carbon stocks for the conterminous United States. ISPRS Journal of Photogrammetry and Remote Sensing 139, 255-271. https://doi.org/10.1016/j.isprsjprs.2018.03.019.

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Year Published: 2018

Effects of contemporary land-use and land-cover change on the carbon balance of terrestrial ecosystems in the United States

Changes in land use and land cover (LULC) can have profound effects on terrestrial carbon dynamics, yet their effects on the global carbon budget remain uncertain. While land change impacts on ecosystem carbon dynamics have been the focus of numerous studies, few efforts have been based on observational data incorporating multiple ecosystem types...

Sleeter, Benjamin M.; Liu, Jinxun; Daniel, Colin; Rayfield, Bronwyn; Sherba, Jason T.; Hawbaker, Todd J.; Zhu, Zhiliang; Selmants, Paul; Loveland, Thomas R.
Sleeter, B.M., et al., 2018, Effects of contemporary land-use and land-cover change on the carbon balance of terrestrial ecosystems in the United States, Environmental Research Letters, doi: https://doi.org/10.1088/1748-9326/aab540