Land Resources

Filter Total Items: 70
Date published: March 7, 2018
Status: Active

Paleoclimate Reconstruction from Marine and Lake Sediments

Instrumental measurements of climate variables (e.g., precipitation, temperature, ocean circulation, etc.) are only available over the past century or less. In order to quantify the rate and magnitude of natural climate variability going back in time beyond the 20th century, scientists rely on paleoclimate reconstructions. 

Date published: February 27, 2018
Status: Active

Paleoceanographic Proxy Calibration

A sediment trap time series in the northern Gulf of Mexico is used to better assess the control of environmental variables (e.g., temperature and salinity) on the flux of both microfossils and molecular fossils to the sediments. The information gained from sediment trap studies is used to develop better proxy-based estimates of past oceanographic conditions from analyses of microfossils and ...

Date published: February 1, 2018

2018 William T. Pecora Award: Nominations being accepted through June 15, 2018

The William T. Pecora Award is presented annually to individuals or groups that have made outstanding contributions toward understanding the Earth by means of remote sensing. Nominations for the 2018 award must be received by June 15, 2018.

Date published: May 12, 2017
Status: Active

Climate Change in the Chesapeake Bay Watershed: Effects on Riverine Discharge, Ecosystems, and Water Quality

The 64,000-square mile watershed that drains to the Chesapeake Bay is highly populated and has diverse land use, including forested, agricultural, and urbanized areas. Increased precipitation in the eastern United States over the last 100 years has affected stream flow and thus the loading of pollutants delivered to the bay. Such pollutants as suspended sediment and dissolved phosphorus and...

Contacts: Karen C Rice
Date published: May 9, 2017

Time Series of Glacier Retreat

The retreat of glaciers in Glacier National Park, Montana, has received widespread attention by the media, the public, and scientists because it is a clear and poignant indicator of change in the northern Rocky Mountains of the USA.  In 2017 the...

Date published: May 9, 2017

GLACIER SIMULATION

The simulation reflects the predicted exponential rise in atmospheric CO2 concentrations, a 2xCO2 "global warming" scenario, by 2030 with a concurrent warming of 2-3 degrees centigrade (4-5 degrees Fahrenheit) by the year 2050. In addition it assumes that precipitation, primarily during the winter, will increase over the same time period five to 10 percent. The animation view of the Blackfoot-...

Date published: March 14, 2017

Quantitative Analysis Using Structural Equation Modeling

USGS scientists have been involved for a number of years in the development and use of Structural Equation Modeling (SEM). This methodology represents an approach to statistical modeling that focuses on the study of complex cause-effect hypotheses about the mechanisms operating in systems. SEM is increasingly used in ecological and environmental studies and this site seeks to provide...

Date published: October 16, 2016

Modeling Past Variation in Florida Manatee Survival, Breeding, and Movements Rates to Establish Baselines for Aquatic Ecosystem and Restoration Research

Long-term monitoring data in the Manatee Individual Photo-identification System (MIPS), developed and coordinated by WARC-Sirenia Project in collaboration with Florida’s Fish and Wildlife Research Institute and Mote Marine Laboratory, are the basis for modeling manatee demography rates.

Date published: September 20, 2016
Status: Active

Improving Our Ability to Forecast Tidal Marsh Response to Sea Level Rise

The Challenge: Accelerations in sea-level rise and changing environmental stressors have important implications for the integrity of coastal wetlands and for efforts to restore and protect the ecosystem services they provide. Their persistence and adaptation to these stressors depends on the net effects of changes in physical processes and biotic responses. Future planning by decision makers...

Date published: September 20, 2016

Post-fire Recovery Patterns in Southwestern Forests

High-severity crown fires in Southwestern dry-conifer forests — resulting from fire suppression, fuel buildups, and drought — are creating large treeless areas that are historically unprecedented in size. These recent stand-replacing fires have reset extensive portions of Southwest forest landscapes, fostering post-fire successional vegetation that can alter ecological recovery trajectories...

Contacts: Collin Haffey
Date published: August 2, 2016
Status: Active

Assessing Coastal Forest Impacts and Resource Management Implications following Hurricane Sandy

Tropical storms and hurricanes wreak havoc with coastal forests where damage can vary with wind speed and approach from isolated treefalls to wide-area blowdowns of whole forests.

Date published: August 1, 2016

Monitoring and Assessing Effects of the Picayune Strand Restoration Project (PSRP) on the Florida Manatee

Critical information predicting condition changes in manatee habitat resulting from the alteration of freshwater flows to estuaries is needed to develop the PSRP Detailed Design and PSRP Operations Plan components and complete consultation under the Endangered Species Act.