Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Vishnu Nandan"'
Autor:
Kiran Yendamuri, Julienne Stroeve, Jens Ehn, William Williams, Vishnu Nandan, Brent Else, Alexander Komarov, Christina Braybrook, Mike Dempsey, C.J. Mundy
Publikováno v:
Arctic Science (2024)
Thinning sea ice cover and earlier melt in the Arctic impacts primary producer (PP) phenology, causing earlier ice algal bloom termination and phytoplankton bloom commencement. However, logistic constraints limit capturing the complete seasonal evolu
Externí odkaz:
https://doaj.org/article/c86b19402f3342bbb2c2150ff043781b
Publikováno v:
Remote Sensing, Vol 16, Iss 12, p 2091 (2024)
The presence of melt ponds on the surface of Arctic Sea ice affects its albedo, thermal properties, and overall melting rate; thus, the detection of melt pond onset is of significant importance for understanding the Arctic’s changing climate. This
Externí odkaz:
https://doaj.org/article/6bf5b384018d43408594f9408622e35f
Autor:
Rosemary Willatt, Julienne C. Stroeve, Vishnu Nandan, Thomas Newman, Robbie Mallett, Stefan Hendricks, Robert Ricker, James Mead, Polona Itkin, Rasmus Tonboe, David N. Wagner, Gunnar Spreen, Glen Liston, Martin Schneebeli, Daniela Krampe, Michel Tsamados, Oguz Demir, Jeremy Wilkinson, Matthias Jaggi, Lu Zhou, Marcus Huntemann, Ian A. Raphael, Arttu Jutila, Marc Oggier
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 20, Pp n/a-n/a (2023)
Abstract Snow depth on sea ice is an Essential Climate Variable and a major source of uncertainty in satellite altimetry‐derived sea ice thickness. During winter of the MOSAiC Expedition, the “KuKa” dual‐frequency, fully polarized Ku‐ and K
Externí odkaz:
https://doaj.org/article/d1643ad2ecb4442eb45f872d743d50cb
Autor:
Robbie D. C. Mallett, Julienne C. Stroeve, Michel Tsamados, Rosemary Willatt, Thomas Newman, Vishnu Nandan, Jack C. Landy, Polona Itkin, Marc Oggier, Matthias Jaggi, Don Perovich
Publikováno v:
Journal of Glaciology, Vol 68, Pp 1014-1026 (2022)
The sub-kilometre scale distribution of snow depth on Arctic sea ice impacts atmosphere-ice fluxes of energy and mass, and is of importance for satellite estimates of sea-ice thickness from both radar and lidar altimeters. While information about the
Externí odkaz:
https://doaj.org/article/8956c64cc7b745a790a563432bef510f
Publikováno v:
International Journal of Applied Earth Observations and Geoinformation, Vol 117, Iss , Pp 103183- (2023)
Arctic sea ice is declining in areal extent and seasonal duration, affecting stable landfast sea ice regimes. These landfast ice regimes are vital platforms for local indigenous subsistence hunters and epontic primary production species supporting lo
Externí odkaz:
https://doaj.org/article/1eb5c377428647739f20246feebc6224
Autor:
Rasmus T. Tonboe, Vishnu Nandan, Marko Makynen, Leif Toudal Pedersen, Stefan Kern, Thomas Lavergne, Johanne Oelund, Gorm Dybkjaer, Roberto Saldo, Marcus Huntemann
Publikováno v:
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 15, Pp 1309-1326 (2022)
Sea ice concentration algorithms using brightness temperatures ($T_{B}$) from satellite microwave radiometers are used to compute sea ice concentration ($c_{\text{ice}}$), sea ice extent, and generate sea ice climate data records. Therefore, it is im
Externí odkaz:
https://doaj.org/article/3cb28648ebe1409b9e8b74ddd2cbd710
Autor:
Vishnu Nandan, Randall K. Scharien, Torsten Geldsetzer, Ronald Kwok, John J. Yackel, Mallik S. Mahmud, Anja Rosel, Rasmus Tonboe, Mats Granskog, Rosemary Willatt, Julienne Stroeve, Daiki Nomura, Markus Frey
Publikováno v:
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 13, Pp 1082-1096 (2020)
Uncertainty in snow properties impacts the accuracy of Arctic sea ice thickness estimates from radar altimetry. On first-year sea ice (FYI), spatiotemporal variations in snow properties can cause the Ku-band main radar scattering horizon to appear ab
Externí odkaz:
https://doaj.org/article/2c58f21b75f44d97a9078ca694e7bedb
Autor:
Joan Francesc Munoz-Martin, Adrian Perez, Adriano Camps, Serni Ribó, Estel Cardellach, Julienne Stroeve, Vishnu Nandan, Polona Itkin, Rasmus Tonboe, Stefan Hendricks, Marcus Huntemann, Gunnar Spreen, Massimiliano Pastena
Publikováno v:
Remote Sensing, Vol 12, Iss 24, p 4038 (2020)
The FSSCat mission was the 2017 ESA Sentinel Small Satellite (S⌃3) Challenge winner and the Copernicus Masters competition overall winner. It was successfully launched on 3 September 2020 onboard the VEGA SSMS PoC (VV16). FSSCat aims to provide coa
Externí odkaz:
https://doaj.org/article/65d84cd81806475895c86f68d04101f2
Autor:
John Yackel, Torsten Geldsetzer, Mallik Mahmud, Vishnu Nandan, Stephen E. L. Howell, Randall K. Scharien, Hoi Ming Lam
Publikováno v:
Remote Sensing, Vol 11, Iss 4, p 417 (2019)
Ku- and C-band spaceborne scatterometer sigma nought (σ°) backscatter data of snow covered landfast first-year sea ice from the Canadian Arctic Archipelago are acquired during the winter season with coincident in situ snow-thickness observations. O
Externí odkaz:
https://doaj.org/article/839f70e6e71d404d9b8dfa92c905f245
Autor:
Woosok Moon, Vishnu Nandan, Randall K Scharien, Jeremy Wilkinson, John J Yackel, Andrew Barrett, Isobel Lawrence, Rebecca A Segal, Julienne Stroeve, Mallik Mahmud, Patrick J Duke, Brent Else
Publikováno v:
Environmental Research Letters, Vol 14, Iss 10, p 104003 (2019)
Snow thickness measurements over relatively smooth Arctic first-year sea ice, obtained near Cambridge Bay in the Canadian Arctic (2014, 2016 and 2017) and near Elson Lagoon in the Alaskan Arctic (2003 and 2006), are analyzed to quantify physical leng
Externí odkaz:
https://doaj.org/article/820cd3cf8b814b42afaf2715056d7def