Melt water stream discharging from Gulkana Glacier, Alaska.
USGS research of the Yukon River has had a long term goal of determining the source and fate of organic carbon transported by the river to the Bering Sea and ultimately the Arctic Ocean.
Images
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Studying Old Organic Carbon in the Yukon River
Melt water stream discharging from Gulkana Glacier, Alaska.
USGS research of the Yukon River has had a long term goal of determining the source and fate of organic carbon transported by the river to the Bering Sea and ultimately the Arctic Ocean.
Avalanche path
Regular avalanche activity keeps this path clear of trees. Snowy peaks of Glacier National Park in the background.
Regular avalanche activity keeps this path clear of trees. Snowy peaks of Glacier National Park in the background.
Blue Ridge Parkway With Fall Foliage
Climbing Waterrock Knob and viewing the Blue Ridge Pkwy below with the fall foliage around.
Climbing Waterrock Knob and viewing the Blue Ridge Pkwy below with the fall foliage around.
Fall Foliage in North Carolina Mountains
Evening sunset over the mountains in Waynesville.
Evening sunset over the mountains in Waynesville.
Fall Foliage in North Carolina Mountains
Evening sunset over the mountains in Waynesville.
Evening sunset over the mountains in Waynesville.
Hidden Lake
This picture was taken while recovering passive atmospheric deposition samplers used to evaluate the nutrient loading of alpine lakes in Washington's National Parks.
This picture was taken while recovering passive atmospheric deposition samplers used to evaluate the nutrient loading of alpine lakes in Washington's National Parks.
A close up of a moose on the Selawik River, Alaska
A close up of a moose on the Selawik River, AlaskaA moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
A close up of a moose on the Selawik River, Alaska
A close up of a moose on the Selawik River, AlaskaA moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
Water on the Prairie
A meandering stream that was a possible biomonitoring site for a USGS project in North Dakota.
A meandering stream that was a possible biomonitoring site for a USGS project in North Dakota.
Water on the Prairie
A meandering stream that was a possible biomonitoring site for a USGS project in North Dakota.
A meandering stream that was a possible biomonitoring site for a USGS project in North Dakota.
Caribou crossing the Selawik River, Alaska
Caribou crossing the Selawik River, Alaska
Monarch Caterpillar or Larva and Droppings
An approximately 2 inch long monarch butterfly caterpillar or larva grazes on the leaves of a butterfly weed in a northern Virginia garden. The dark lumps on the leaves around the caterpillar are its droppings or feces.
An approximately 2 inch long monarch butterfly caterpillar or larva grazes on the leaves of a butterfly weed in a northern Virginia garden. The dark lumps on the leaves around the caterpillar are its droppings or feces.
Atlantic Ocean Sunrise
Subtropical Atlantic Ocean sunrise with the dark clouds of a distant offshore thunderstorm.
Subtropical Atlantic Ocean sunrise with the dark clouds of a distant offshore thunderstorm.
Low Tide Beach at Dawn
Florida beach at low tide. Note the sandbar and sculpted sands in the intertidal zone.
Florida beach at low tide. Note the sandbar and sculpted sands in the intertidal zone.
Forest Roads in the Lower North Fork Siletz River Valley
Forest Roads in the Lower North Fork Siletz River ValleyForest roads running through Bureau of Land Management land in the lower North Fork Siletz River valley in the Mary's Peak District of the northwest Oregon.
Forest Roads in the Lower North Fork Siletz River Valley
Forest Roads in the Lower North Fork Siletz River ValleyForest roads running through Bureau of Land Management land in the lower North Fork Siletz River valley in the Mary's Peak District of the northwest Oregon.
A bridge over the Matanuska River
Scenic view of the Matanuska River with a bridge spanning across. This photo was part of an erosion project on the river.
Scenic view of the Matanuska River with a bridge spanning across. This photo was part of an erosion project on the river.
Mud Lake Channel Arrowwood National Wildlife Refuge
Mud Lake Channel Arrowwood National Wildlife RefugeMud Lake Channel from Arrowwood Lake to Jim Lake, looking toward Arrowwood Lake. Photograph taken from 11th Street SE between Edmunds, North Dakota, and State Highway 9. The downstream Jamestown Reservoir was filled in 1965 and backed water onto the Arrowwood National Wildlife Refuge, preventing ideal management in most years.
Mud Lake Channel Arrowwood National Wildlife Refuge
Mud Lake Channel Arrowwood National Wildlife RefugeMud Lake Channel from Arrowwood Lake to Jim Lake, looking toward Arrowwood Lake. Photograph taken from 11th Street SE between Edmunds, North Dakota, and State Highway 9. The downstream Jamestown Reservoir was filled in 1965 and backed water onto the Arrowwood National Wildlife Refuge, preventing ideal management in most years.
Caribbean Sunset in the British Virgin Islands
Caribbean sunset as seen from the British Virgin Islands.
Caribbean sunset as seen from the British Virgin Islands.
Sheltering Caribbean Headland
Golden early morning sunlight on a dry, rocky headland. Note the pelican, the cacti, and the xeric vegetation.
Golden early morning sunlight on a dry, rocky headland. Note the pelican, the cacti, and the xeric vegetation.
Freshwater tidal marshes of the Columbia River estuary, Oregon
Freshwater tidal marshes of the Columbia River estuary, OregonFreshwater tidal marsh of the Columbia River estuary, Cathlamet Bay in foreground, uplifted coastal ranges of the Cascadia forearc of Washington in background.
Freshwater tidal marshes of the Columbia River estuary, Oregon
Freshwater tidal marshes of the Columbia River estuary, OregonFreshwater tidal marsh of the Columbia River estuary, Cathlamet Bay in foreground, uplifted coastal ranges of the Cascadia forearc of Washington in background.
Cattle on rangeland on Mission Peak, near Fremont, CA.
Cattle on rangeland on Mission Peak, near Fremont, CA.Cattle on rangeland on Mission Peak, near Fremont, California, in the San Francisco Bay area. David Amme, California Native Grasslands Association.
Cattle on rangeland on Mission Peak, near Fremont, CA.
Cattle on rangeland on Mission Peak, near Fremont, CA.Cattle on rangeland on Mission Peak, near Fremont, California, in the San Francisco Bay area. David Amme, California Native Grasslands Association.
Wood Duck (Aix sponsa)
Brightly-colored male wood duck.
Brightly-colored male wood duck.