A5035436480- Fire effects on ecosystems
- Climate change and permafrost
- Peatlands and Wetlands Ecology
- Soil Moisture and Remote Sensing
- Remote Sensing and LiDAR Applications
- Cryospheric studies and observations
- Coastal wetland ecosystem dynamics
- Atmospheric and Environmental Gas Dynamics
- Landslides and related hazards
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Rangeland and Wildlife Management
- Soil erosion and sediment transport
- Flood Risk Assessment and Management
- Remote Sensing in Agriculture
- Hydrology and Watershed Management Studies
- Soil Geostatistics and Mapping
- Arctic and Antarctic ice dynamics
- Aeolian processes and effects
- Precipitation Measurement and Analysis
- Methane Hydrates and Related Phenomena
- Ecology and biodiversity studies
- Forest ecology and management
- Marine and environmental studies
- Botany and Plant Ecology Studies
- Indigenous Studies and Ecology
Michigan Technological University
2016-2025
University of New Brunswick
2013-2016
Michigan United
2009
General Dynamics (United States)
2006
Environmental Research Institute of Michigan
1994-2005
GTx (United States)
2000
Abstract [1] This synthesis addresses the vulnerability of North American high-latitude soil organic carbon (SOC) pool to climate change. Disturbances caused by warming in arctic, subarctic, and boreal environments can result significant redistribution C among major reservoirs with potential global impacts. We divide current northern SOC pools into (1) near-surface soils where is affected seasonal freeze-thaw processes changes moisture status, (2) deeper permafrost peatland strata down...
Significance Black spruce is the dominant tree species in boreal North America and has shaped forest flammability, carbon storage, other landscape processes over last several thousand years. However, climate warming increases wildfire activity may be undermining its ability to maintain dominance, shifting forests toward alternative forested nonforested states. Using data from across America, we evaluate whether loss of black resilience already widespread. Resilience was most common outcome,...
The National Aeronautics and Space Administration Soil Moisture Active Passive (SMAP) mission has been validating its soil moisture (SM) products since the start of data production on March 31, 2015. Prior to launch, defined a set criteria for core validation sites (CVS) that enable testing key SM accuracy requirement (unbiased root-mean-square error <0.04 m<sup>3</sup>/m<sup>3</sup>). approach also includes other (“sparse network”) <i>in situ</i> measurements,...
Detailed information on the spatial distribution of wetlands is crucial for sustainable management and resource assessment. Furthermore, regularly updated wetland inventories are particular importance given that comprise a dynamic, rather than permanent, land condition. Accordingly, satellite-derived maps greatly beneficial, as they capture synoptic multi-temporal view landscapes. Leveraging state-of-the-art remote sensing data tools, this study produces high-resolution 10-m inventory map...
Methods using extensive field data and three-season Landsat TM PALSAR imagery were developed to map wetland type identify potential stressors (i.e., adjacent land use) for the United States Canadian Laurentian coastal Great Lakes. The mapped area included coastline 10 km inland capture region hydrologically connected Maps in cooperation with overarching Lakes Consortium plan provide a comprehensive regional baseline suitable assessment management by agencies at local, tribal, state, federal...
Abstract Active layer thickness (ALT) is a critical metric for monitoring permafrost. How soil moisture influences ALT depends on two competing hypotheses: (a) increased increases the latent heat of fusion thaw, resulting in shallower active layers, and (b) thermal conductivity, deeper layers. To investigate their relative influence thaw depth, we analyzed Field Measurements Soil Moisture Layer Thickness (SMALT) Alaska Canada dataset, consisting thousands measurements depth collected at...
Abstract Ecosystems in the North American Arctic-Boreal Zone (ABZ) experience a diverse set of disturbances associated with wildfire, permafrost dynamics, geomorphic processes, insect outbreaks and pathogens, extreme weather events, human activity. Climate warming ABZ is occurring at over twice rate global average, as result extent, frequency, severity these are increasing rapidly. Disturbances span wide gradient spatiotemporal scales have varying impacts on ecosystem properties function....
In this study the utility of NASA's Shuttle Imaging Radar-C (SIR-C) data are evaluated for wetland mapping and monitoring. The fully polarimetric L- C-band used in hierarchical analysis maximum likelihood classification techniques. Each map produced is compared with Environmental Protection Agency's Multi Resolution Land Characteristics pixelto-pixel accuracy assessment. Results show that both C- band necessary detection flooding beneath vegetated canopies. HH-polarization found others to be...
A multidecadal analysis of fire in Alaskan Arctic tundra was completed using records from the Alaska Large Fire Database. Tundra vegetation fires are defined by Circumpolar Vegetation Map and divided into five ecoregions Alaska. detailed review these regions is presented, an future potential performed based on climate scenarios. The average size data record 22 km2 (5454 acres). Fires show a mean 10 (2452 acres) median 0.064 (16 acres), indicating small common. Although uncommon, 16 larger...
Abstract Tropical peatlands store a significant portion of the global soil carbon (C) pool. However, tropical mountain contain extensive peat soils that have yet to be mapped or included in C estimates. This lack data hinders our ability inform policy and apply sustainable management practices these are experiencing unprecedented high rates land use cover change. Rapid large‐scale mapping activities urgently needed quantify wetland extent rate degradation. We tested combination multidate,...
Recently, there has been a significant increase in efforts to better inventory and manage important ecosystems across Canada using advanced remote sensing techniques. In this study, we improved the method results of our first-generation Canadian wetland map at 10-m resolution. Iin order classification accuracy, main contributions new study are adding more training data process Random Forest (RF) models on Google Earth Engine (GEE) platform within boundaries ecozones rather than provinces. A...
Development of the Canadian Wetland Inventory Map (CWIM) has thus far proceeded over two generations, reporting extent and location bog, fen, swamp, marsh, water wetlands across country with increasing accuracy. Each generation this training inventory improved previous results by including additional reference wetland data focusing on processing at scale ecozone, which represent ecologically distinct regions Canada. The first second generations attained relatively highly accurate an average...
Abstract Soil moisture dynamics in the presence of dense vegetation canopies are determinants ecosystem function and biogeochemical cycles, but capability existing spaceborne sensors to support reliable useful estimates is not known. New results from a recently initiated field experiment northeast United States show that National Aeronautics Space Administration (NASA) SMAP (Soil Moisture Active Passive) satellite capable retrieving soil under temperate forest canopies. We present an...
Wetlands provide many benefits, such as water storage, flood control, transformation and retention of chemicals, habitat for species plants animals. The ongoing degradation wetlands in the Great Lakes basin has been caused by a number factors, including climate change, urbanization, agriculture. Mapping monitoring across large spatial temporal scales have proved challenging; however, recent advancements accessibility processing efficiency remotely sensed imagery facilitated these...
A multifrequency, multipolarization airborne SAR data set was utilized to examine the relationship between radar backscatter and aboveground biomass. This also used potential of estimate biomass in these forests. The total test stands this study ranged from <1-50 kg m/sup -2/. Not only considered, but tree boles, branches, needles/leaves. Significant correlations were found all three frequencies imagery (C-, L- P-band), At P- L-bands, greatest sensitivity change occurred HH VH polarized...