Dorothy K Hall
Biographic Data
| ID | 5453434 |
|---|---|
| NAME | Dorothy K Hall |
| GIVEN NAMES | Dorothy K |
| FAMILY NAME | Hall |
| SIGNATURE | HALL D K |
| AFFILIATIONS | Goddard Space Flight Center |
| ORCID | 0000-0001-8921-0773 |
| VERIFIED | Yes |
| TOTAL WORKS | 9 |
| TOTAL CITATIONS | 6 |
| AUTHOR COUNT | 9 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1947 |
| LATEST PUBLICATION YEAR | 2014 |
| H-INDEX | 1 |
Climate trends in the Arctic as observed from space
The Arctic is a region in transformation. Warming in the region has been amplified, as expected from ice-albedo feedback effects, with the rate of warming observed to be ∼0.60 ± 0.07°C/decade in the Arctic (>64°N) compared to ∼0.17°C/decade globally during the last three decades. This increase in surface temperature is manifested in all components of the cryosphere. In particular, the sea ice extent has been declining at the rate of ∼3.8%/decade,…
Spring snow melt timing and changes over Arctic lands
Spring snow cover over Arctic lands has, on average, melted approximately 4–7 days earlier since the late 1980s compared to the previous 20 years. The earlier disappearance of snow has been identified in non-mountainous regions at the 60° and 70°N parallels over Eurasia and North America using visible satellite observations of continental snow cover extent (SCE) mapped by the National Oceanic and Atmospheric Administration (NOAA). The change was …
Seasonal snow extent and snow mass in South America using SSMI passive microwave data 1
Seasonal snow cover in primarily non‐mountainous areas of South America was examined in this study using passive microwave satellite data from the Special Sensor Microwave Imagers (SSM/I) on board Defense Meteorological Satellite Program (DMSP) satellites. For the period 1992–1998, both snow‐cover extent and snow depth (snow mass) were investigated during the winter months (May‐August) in Argentina and Chile. Most of the seasonal snow in South Am…
Determination of actual snow-covered area using Landsat TM and digital elevation model data in Glacier National Park, Montana
In the future, data from the moderate resolution imaging spectroradiometer (MODIS) will be employed to map snow in an automated environment at a resolution of 250 m to 1 km. Using Landsat thematic mapper (TM) data, an algorithm, SNOMAP, has been developed to map snow-covered area. This algorithm will be used, with appropriate modification, with MODIS data following the launch of the first Earth Observing System (EOS) platform in 1998. SNOMAP has …
Derivation of Snow Water Equivalent in Boreal Forests Using Microwave Radiometry
Efforts have been made by several investigators to produce a reliable global microwave snow algorithm to estimate snow depth or snow water equivalent (snow volume) and snow extent. Complications arise when trying to apply a global algorithm to specific regions where the climate, snowpack structure and vegetation vary. In forest regions, the microwave emission from dense coniferous forests may overwhelm the emission from the underlying snow-covere…
The origin of water feeding icings on the eastern North Slope of Alaska
Stream icings are a unique type of river ice that form in a portion of a stream channel which freezes deeply enough to restrict channel flow. Icings are usually found in Arctic and sub- Arctic regions because of the prevalence of permafrost and seasonally frozen ground in these regions. Hydraulic pressure builds up at the point of constriction as the river ice and permafrost thicken during the freeze-up period (Fig 1). Water is forced up through …
Mineral Precipitation in North Slope River Icings
Powdered calcium carbonate (CaCO3) patches averaging 4 cm in thickness were found on icings (aufeis fields) in the Canning and Shaviovik Rivers in northeastern Alaska. The presence of this material on aufeis suggests that much of the water which feeds the aufeis is coming from depth and has flowed through calcareous bedrock. Aufeis forms during the winter at or below the point where groundwater discharges, or when river water is forced upwards th…
The 1977 Tundra Fire in the Kokolik River Area of Alaska
Widespread fires occurred on the Seward Peninsula, Alaska, during the summer of 1977. During this period there was also one large natural fire in the northern part of the state. Presumably caused by lightening, it occurred due east of Point Lay and several kilometres southwest of the Kokolik River (69 30 N, 161 50 W) on the boundary between the coastal plain and the northern foothills .... This was the farthest north a fire had ever been fought b…
A Co-operative Program
Climate trends in the Arctic as observed from space
The Arctic is a region in transformation. Warming in the region has been amplified, as expected from ice-albedo feedback effects, with the rate of warming observed to be ∼0.60 ± 0.07°C/decade in the Arctic (>64°N) compared to ∼0.17°C/decade globally during the last three decades. This increase in surface temperature is manifested in all components of the cryosphere. In particular, the sea ice extent has been declining at the rate of ∼3.8%/decade,…
Determination of actual snow-covered area using Landsat TM and digital elevation model data in Glacier National Park, Montana
In the future, data from the moderate resolution imaging spectroradiometer (MODIS) will be employed to map snow in an automated environment at a resolution of 250 m to 1 km. Using Landsat thematic mapper (TM) data, an algorithm, SNOMAP, has been developed to map snow-covered area. This algorithm will be used, with appropriate modification, with MODIS data following the launch of the first Earth Observing System (EOS) platform in 1998. SNOMAP has …
A Co-operative Program
The 1977 Tundra Fire in the Kokolik River Area of Alaska
Widespread fires occurred on the Seward Peninsula, Alaska, during the summer of 1977. During this period there was also one large natural fire in the northern part of the state. Presumably caused by lightening, it occurred due east of Point Lay and several kilometres southwest of the Kokolik River (69 30 N, 161 50 W) on the boundary between the coastal plain and the northern foothills .... This was the farthest north a fire had ever been fought b…
Mineral Precipitation in North Slope River Icings
Powdered calcium carbonate (CaCO3) patches averaging 4 cm in thickness were found on icings (aufeis fields) in the Canning and Shaviovik Rivers in northeastern Alaska. The presence of this material on aufeis suggests that much of the water which feeds the aufeis is coming from depth and has flowed through calcareous bedrock. Aufeis forms during the winter at or below the point where groundwater discharges, or when river water is forced upwards th…
The origin of water feeding icings on the eastern North Slope of Alaska
Stream icings are a unique type of river ice that form in a portion of a stream channel which freezes deeply enough to restrict channel flow. Icings are usually found in Arctic and sub- Arctic regions because of the prevalence of permafrost and seasonally frozen ground in these regions. Hydraulic pressure builds up at the point of constriction as the river ice and permafrost thicken during the freeze-up period (Fig 1). Water is forced up through …
Derivation of Snow Water Equivalent in Boreal Forests Using Microwave Radiometry
Efforts have been made by several investigators to produce a reliable global microwave snow algorithm to estimate snow depth or snow water equivalent (snow volume) and snow extent. Complications arise when trying to apply a global algorithm to specific regions where the climate, snowpack structure and vegetation vary. In forest regions, the microwave emission from dense coniferous forests may overwhelm the emission from the underlying snow-covere…
Determination of actual snow-covered area using Landsat TM and digital elevation model data in Glacier National Park, Montana
In the future, data from the moderate resolution imaging spectroradiometer (MODIS) will be employed to map snow in an automated environment at a resolution of 250 m to 1 km. Using Landsat thematic mapper (TM) data, an algorithm, SNOMAP, has been developed to map snow-covered area. This algorithm will be used, with appropriate modification, with MODIS data following the launch of the first Earth Observing System (EOS) platform in 1998. SNOMAP has …
Seasonal snow extent and snow mass in South America using SSMI passive microwave data 1
Seasonal snow cover in primarily non‐mountainous areas of South America was examined in this study using passive microwave satellite data from the Special Sensor Microwave Imagers (SSM/I) on board Defense Meteorological Satellite Program (DMSP) satellites. For the period 1992–1998, both snow‐cover extent and snow depth (snow mass) were investigated during the winter months (May‐August) in Argentina and Chile. Most of the seasonal snow in South Am…
Spring snow melt timing and changes over Arctic lands
Spring snow cover over Arctic lands has, on average, melted approximately 4–7 days earlier since the late 1980s compared to the previous 20 years. The earlier disappearance of snow has been identified in non-mountainous regions at the 60° and 70°N parallels over Eurasia and North America using visible satellite observations of continental snow cover extent (SCE) mapped by the National Oceanic and Atmospheric Administration (NOAA). The change was …
Climate trends in the Arctic as observed from space
The Arctic is a region in transformation. Warming in the region has been amplified, as expected from ice-albedo feedback effects, with the rate of warming observed to be ∼0.60 ± 0.07°C/decade in the Arctic (>64°N) compared to ∼0.17°C/decade globally during the last three decades. This increase in surface temperature is manifested in all components of the cryosphere. In particular, the sea ice extent has been declining at the rate of ∼3.8%/decade,…
Geography (8 works) · Geology (8 works) · Cryospheric studies and observations (7 works) · Climate change and permafrost (6 works) · Physical geography (6 works) · Arctic (5 works) · Geology (5 works) · Oceanography (5 works) · Snow (5 works) · Arctic and Antarctic ice dynamics (4 works)