We investigate the wind driven velocity structure of the California Current (CC) using a 12-year ... more We investigate the wind driven velocity structure of the California Current (CC) using a 12-year time series of ageostrophic velocities, ocean surface winds, and two regression models of the system. The ageostrophic current is estimated by removing geostrophic velocities, which are determined by the combination of CTD (conductivity, temperature, depth) and altimetry data from total flow velocity observations. Total current
IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004
The Maximum Cross Correlation (MCC) method is used with infrared and passive microwave images of ... more The Maximum Cross Correlation (MCC) method is used with infrared and passive microwave images of sea surface temperature (SST) along with ocean color images to compute sea surface currents from sequential imagery. These surface currents are then merged with geostrophic surface currents computed from coincident satellite altimetry observations to yield a high spatial resolution map of the surface mesoscale currents
The generation of climate data records (CDRs) is a critical step in providing the necessary infor... more The generation of climate data records (CDRs) is a critical step in providing the necessary information for scientists, decision-makers, and stakeholders to make adaptive choices that could improve the nation's resiliency to environmental change and variability, maintain our economic vitality, and improve the safety and comfort of U.S. citizens. These CDRs are particularly needed for the Arctic, where existing evidence
The purpose of this project is to study the error sources in computing surface advection from seq... more The purpose of this project is to study the error sources in computing surface advection from sequential satellite images primarily focusing on the interpretation of infrared weather satellite-derived sea surface temperature (SST) images. To evaluate ihe/effects of heating and
To assess the impact of anthropogenic effects on global climate and to quantitatively distinguish... more To assess the impact of anthropogenic effects on global climate and to quantitatively distinguish them from natural effects is a daunting scientific task. To meet this challenge, satellite instruments, for exam-
The continuation of the EOSDIS Testbed ("Testbed") hasmaterialized from a multi-task sy... more The continuation of the EOSDIS Testbed ("Testbed") hasmaterialized from a multi-task system to a fully functional stand-alone dataarchive distribution center that once was only X-Windows driven to asystem that is accessible by all types of users and computers via the WorldWide Web.Throughout the past months, the Testbed has evolved into acompletely new system. The current system is now accessible throughNetscape, Mosaic and all other servers that can contact the World WideWeb. On October 1, 1995 we will open to the public and we expect thatthe statistics of the type of user, where they are located, and what they arelooking for will drastically change.The current statistics for this quarter are really unusable since theUniversity of Colorado satellite retrieving station has been down since thefirst of June 1995. Although it should be noted that because of this downtune we have gained important information in that past data has not been alarge draw. In fact, past data has ra...
: Our project involves the analysis of satellite and expendable bathythermograph data for the Abr... more : Our project involves the analysis of satellite and expendable bathythermograph data for the Abrupt Topography program. The satellite data analysis concentrated on the analysis of GEOSAT altimeter data since it was established that the surface temperature gradients (in the region around the Fieberling seamount) were too weak to be viewed and monitored by the AVHRR on NOAA satellites. Using GEOSAT data we have been able to isolate the modes of sea surface height variability in the Fieberling region. A total of 7 XBT surveys have now been collected over the Fieberling site. Keywords: Ocean bottom topography; Space-based/shipboard altimeters.
: This project studies error sources in computing surface advection from sequential satellite ima... more : This project studies error sources in computing surface advection from sequential satellite images primarily focusing on interpretation of infrared weather satellite-derived sea surface temperature (SST) images. To evaluate effects of heating and cooling at the ocean's surface the FASINEX data set was acquired along with coincident AVHRR images of the same region. A simple study of the satellite temperatures and those measured at the FASINEX moorings suggests the advective nature of the surface temperature field. A more detailed model is being developed to reveal detailed relationships between surface heat fluxes and the change of SST seen in the satellite images. We are also studying simultaneous of AVHRR and CZCS imagery to understand the similarities and differences between surface motion computed from changes in SST patterns and motion computed from changes in ocean color as revealed by the CZCS instrument. Unfortunately we have CZCS imagery available with 24 hour separati...
We investigate the wind driven velocity structure of the California Current (CC) using a 12-year ... more We investigate the wind driven velocity structure of the California Current (CC) using a 12-year time series of ageostrophic velocities, ocean surface winds, and two regression models of the system. The ageostrophic current is estimated by removing geostrophic velocities, which are determined by the combination of CTD (conductivity, temperature, depth) and altimetry data from total flow velocity observations. Total current
IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004
The Maximum Cross Correlation (MCC) method is used with infrared and passive microwave images of ... more The Maximum Cross Correlation (MCC) method is used with infrared and passive microwave images of sea surface temperature (SST) along with ocean color images to compute sea surface currents from sequential imagery. These surface currents are then merged with geostrophic surface currents computed from coincident satellite altimetry observations to yield a high spatial resolution map of the surface mesoscale currents
The generation of climate data records (CDRs) is a critical step in providing the necessary infor... more The generation of climate data records (CDRs) is a critical step in providing the necessary information for scientists, decision-makers, and stakeholders to make adaptive choices that could improve the nation's resiliency to environmental change and variability, maintain our economic vitality, and improve the safety and comfort of U.S. citizens. These CDRs are particularly needed for the Arctic, where existing evidence
The purpose of this project is to study the error sources in computing surface advection from seq... more The purpose of this project is to study the error sources in computing surface advection from sequential satellite images primarily focusing on the interpretation of infrared weather satellite-derived sea surface temperature (SST) images. To evaluate ihe/effects of heating and
To assess the impact of anthropogenic effects on global climate and to quantitatively distinguish... more To assess the impact of anthropogenic effects on global climate and to quantitatively distinguish them from natural effects is a daunting scientific task. To meet this challenge, satellite instruments, for exam-
The continuation of the EOSDIS Testbed ("Testbed") hasmaterialized from a multi-task sy... more The continuation of the EOSDIS Testbed ("Testbed") hasmaterialized from a multi-task system to a fully functional stand-alone dataarchive distribution center that once was only X-Windows driven to asystem that is accessible by all types of users and computers via the WorldWide Web.Throughout the past months, the Testbed has evolved into acompletely new system. The current system is now accessible throughNetscape, Mosaic and all other servers that can contact the World WideWeb. On October 1, 1995 we will open to the public and we expect thatthe statistics of the type of user, where they are located, and what they arelooking for will drastically change.The current statistics for this quarter are really unusable since theUniversity of Colorado satellite retrieving station has been down since thefirst of June 1995. Although it should be noted that because of this downtune we have gained important information in that past data has not been alarge draw. In fact, past data has ra...
: Our project involves the analysis of satellite and expendable bathythermograph data for the Abr... more : Our project involves the analysis of satellite and expendable bathythermograph data for the Abrupt Topography program. The satellite data analysis concentrated on the analysis of GEOSAT altimeter data since it was established that the surface temperature gradients (in the region around the Fieberling seamount) were too weak to be viewed and monitored by the AVHRR on NOAA satellites. Using GEOSAT data we have been able to isolate the modes of sea surface height variability in the Fieberling region. A total of 7 XBT surveys have now been collected over the Fieberling site. Keywords: Ocean bottom topography; Space-based/shipboard altimeters.
: This project studies error sources in computing surface advection from sequential satellite ima... more : This project studies error sources in computing surface advection from sequential satellite images primarily focusing on interpretation of infrared weather satellite-derived sea surface temperature (SST) images. To evaluate effects of heating and cooling at the ocean's surface the FASINEX data set was acquired along with coincident AVHRR images of the same region. A simple study of the satellite temperatures and those measured at the FASINEX moorings suggests the advective nature of the surface temperature field. A more detailed model is being developed to reveal detailed relationships between surface heat fluxes and the change of SST seen in the satellite images. We are also studying simultaneous of AVHRR and CZCS imagery to understand the similarities and differences between surface motion computed from changes in SST patterns and motion computed from changes in ocean color as revealed by the CZCS instrument. Unfortunately we have CZCS imagery available with 24 hour separati...
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Papers by William Emery