Rick Danielson

An assessment of variance in ocean current signal and noise shared by in situ observations (drifters) and a large gridded analysis (GlobCurrent) is sought as a function of day of the year for 1993–2015 and across a broad spectrum of current speed. Regardless of the division of collocations, it is difficult to claim that any synoptic assessment can...

An assessment of variance in ocean current signal and noise shared by in situ observations (drifters) and a large gridded analysis (GlobCurrent) is sought as a function of day of the year for 1993–2015 and across a broad spectrum of current speed. Regardless of the division of collocations, it is difficult to claim that any synoptic assessment can...

For over a decade, several research groups have been developing air-sea heat flux information over the global ocean, including latent (LHF) and sensible (SHF) heat fluxes over the global ocean. This paper aims to provide new insight into the quality and error characteristics of turbulent heat flux estimates at various spatial and temporal scales (f...

For over a decade, several research groups have been developing air-sea heat flux information over the global ocean, including latent (LHF) and sensible (SHF) heat fluxes over the global ocean. This paper aims to provide new insight into the quality and error characteristics of turbulent heat flux estimates at various spatial and temporal scales (f...

Dataset published by www.seanoe.org providing GlobCurrent and drifter velocity collocations. Download is available as a gzipped file at http://doi.org/10.17882/50225. GlobCurrent is an analysis that linearly combines the geostrophic and Ekman components. Drifters respond locally to a combination of geostrophic, Ekman, tidal, inertial, Stokes, and w...

Observations of extreme conditions, characterized by high heat flux, rapidly changing surface wind, or strong ocean current, are rare. Although analyses provide estimates of these conditions, because there are few observations to begin with, it is difficult to calibrate and validate an analysis or a retrieval assuming independent observations (cf....

Observations of extreme conditions, characterized by high heat flux, rapidly changing surface wind, or strong ocean current, are rare. Although analyses provide estimates of these conditions, because there are few observations to begin with, it is difficult to calibrate and validate an analysis or a retrieval assuming independent observations (cf....

Observations of extreme conditions, characterized by high heat flux, rapidly changing surface wind, or strong ocean current, are rare. Although analyses provide estimates of these conditions, because there are few observations to begin with, it is difficult to calibrate and validate an analysis or a retrieval assuming independent observations (cf....

Observations of extreme conditions, characterized by high heat flux, rapidly changing surface salinity, or strong ocean current, are rare. Although analyses provide estimates of these conditions, because there are few observations to begin with, it is difficult to separately characterize (in terms of calibration and validation) extreme and typical...

The ESA Data User Element (DUE) funded GlobCurrent project (http://www.globcurrent.org) aims to: (i) advance the quantitative estimation of ocean surface currents from satellite sensor synergy; and (ii) demonstrate impact in user-led scientific, operational and commercial applications that, in turn, will improve and strengthen the uptake of satelli...

Poster providing introduction to the ESA-funded GlobCurrent project, covering the user requirements and the intended methodology Also available as a short YouTube video : https://www.youtube.com/watch?v=LQJ_EPlB_94

A simple method of interpolating sea-surface temperature (SST) and its measurement method is applied to western North Pacific ship and buoy observations taken between 1970 and 2000. Comparisons are made between the resulting quasi-daily in situ analyses and more inclusive analyses based mainly on satellite infrared observations. In terms of analysi...

Surface wind analyses are constructed from spaceborne synthetic aperture radar (SAR) measurements along coastal regions of eastern and western North America and collocated operational marine wind forecasts. Each analysis minimizes the error sum of squares of the wind forecast, the SAR backscatter, and wind direction that is inferred from the SAR ba...

The sequential development of a western, and then an eastern, North Pacific cyclone is examined in terms of eddy energy and a phase-independent wave activity. Based on the propagation of both a contiguous wave activity center and eddy energy, the development of the western cyclone appears to influence its downstream neighbor. A quantitative compari...

The impact of eddy energy growth and radiation from a western North Pacific cyclone on the intensity of an eastern North Pacific cyclone a few days later is examined. Associated with the western cyclone is an upstream ridge and trough couplet, initially over Siberia on 8 March 1977. The amplitude of this couplet is perturbed in 5-day numerical simu...

Error estimates for the surface winds retrieved from Radarsat-1 synthetic aperture radar (SAR) backscatter cross section are derived using nonlinear regression. The SAR-wind relationship employed is the European Remote Sensing (ERS) C-Band model (CMOD) and the polarization ratio of Vachon and Dobson (2000). Non-precipitating regions of the SAR acqu...

A quantification of local energy propagation is employed to distinguish cases of downstream baroclinic development, as described by Orlanski and Sheldon (1995), from among 41 cold‐season cyclones that intensified strongly over the eastern North Pacific Ocean. A group of western North Pacific cyclones is employed to confirm that, in a composite sens...

Thirty-five cases of cyclogenesis that occurred during the cold seasons from 1975 to 1995 in the western North Pacific Ocean are studied to determine common and disparate dynamic and thermodynamic structures in both the ordinary and rapid developments. An analysis of 1000-hPa height and 1000-500-hPa thickness anomalies with respect to the 20-yr cli...

A nonlinear regression approach is employed to construct a surface wind analysis from a synthetic aperture radar (SAR) acquisition off the west coast of North America and a collocated operational marine wind forecast. The analysis is iteratively constructed using a cost function that minimizes discrepancies with the wind forecast, the SAR backscatt...