Zobrazeno 1 - 10
of 186
pro vyhledávání: '"Chris Derksen"'
Publikováno v:
Canadian Journal of Remote Sensing, Vol 49, Iss 1 (2023)
Understanding the processes driving terrestrial vegetation productivity dynamics in boreal ecosystems is critical for accurate assessments of carbon dynamics. Monitoring these dynamics typically requires a fusion of broad-scale remote sensing observa
Externí odkaz:
https://doaj.org/article/f035073c8d7c42cab9b48f456a9e3444
Autor:
Kari Luojus, Jouni Pulliainen, Matias Takala, Juha Lemmetyinen, Colleen Mortimer, Chris Derksen, Lawrence Mudryk, Mikko Moisander, Mwaba Hiltunen, Tuomo Smolander, Jaakko Ikonen, Juval Cohen, Miia Salminen, Johannes Norberg, Katriina Veijola, Pinja Venäläinen
Publikováno v:
Scientific Data, Vol 8, Iss 1, Pp 1-16 (2021)
Measurement(s) snow • snow mass • snow water equivalent Technology Type(s) satellite imaging Sample Characteristic - Environment cryosphere Sample Characteristic - Location Northern Hemisphere Machine-accessible metadata file describing the repor
Externí odkaz:
https://doaj.org/article/07446af8494c46d3b32cfb4e474fcacc
Publikováno v:
Frontiers in Climate, Vol 4 (2022)
Externí odkaz:
https://doaj.org/article/1ce98a7676724cd6a31b713f68651d4b
Autor:
Heather Kropp, Michael M Loranty, Nick Rutter, Christopher G Fletcher, Chris Derksen, Lawrence Mudryk, Markus Todt
Publikováno v:
Environmental Research Letters, Vol 17, Iss 10, p 104010 (2022)
The timing and rate of northern high latitude spring snowmelt plays a critical role in surface albedo, hydrology, and soil carbon cycling. Ongoing changes in the abundance and distribution of trees and shrubs in tundra and boreal ecosystems can alter
Externí odkaz:
https://doaj.org/article/d1b165dcd41d4823b674e0c63a4f003f
Autor:
John C. Fyfe, Chris Derksen, Lawrence Mudryk, Gregory M. Flato, Benjamin D. Santer, Neil C. Swart, Noah P. Molotch, Xuebin Zhang, Hui Wan, Vivek K. Arora, John Scinocca, Yanjun Jiao
Publikováno v:
Nature Communications, Vol 8, Iss 1, Pp 1-7 (2017)
Mountain snowpack in the western United States has declined over the past three decades. Fyfeet al. show that this trend cannot be explained by natural variability alone and show that under a business-as-usual scenario a further loss of up to 60% in
Externí odkaz:
https://doaj.org/article/0ee67715d02e421491e615489cfbcac3
Autor:
Youngwook Kim, John S. Kimball, Xiaolan Xu, R. Scott Dunbar, Andreas Colliander, Chris Derksen
Publikováno v:
Remote Sensing, Vol 11, Iss 11, p 1317 (2019)
More than half of the global land area undergoes seasonal frozen and thawed conditions that constrain eco-hydrological processes. The freeze-thaw (FT) retrieval from satellite microwave remote sensing detects landscape changes between frozen and non-
Externí odkaz:
https://doaj.org/article/74118bdc379f4d33b279365aac0d04f7
Autor:
Alexandre Roy, Marion Leduc-Leballeur, Ghislain Picard, Alain Royer, Peter Toose, Chris Derksen, Juha Lemmetyinen, Aaron Berg, Tracy Rowlandson, Mike Schwank
Publikováno v:
Remote Sensing, Vol 10, Iss 9, p 1451 (2018)
Detailed angular ground-based L-band brightness temperature (TB) measurements over snow covered frozen soil in a prairie environment were used to parameterize and evaluate an electromagnetic model, the Wave Approach for LOw-frequency MIcrowave emissi
Externí odkaz:
https://doaj.org/article/3c67064212f8476e9c079399e3cfff9d
Autor:
Juha Lemmetyinen, Chris Derksen, Helmut Rott, Giovanni Macelloni, Josh King, Martin Schneebeli, Andreas Wiesmann, Leena Leppänen, Anna Kontu, Jouni Pulliainen
Publikováno v:
Remote Sensing, Vol 10, Iss 2, p 170 (2018)
Current methods for retrieving SWE (snow water equivalent) from space rely on passive microwave sensors. Observations are limited by poor spatial resolution, ambiguities related to separation of snow microstructural properties from the total snow mas
Externí odkaz:
https://doaj.org/article/01719e1cb6af487eb5577e9d6494b5cc
Publikováno v:
Remote Sensing, Vol 9, Iss 12, p 1242 (2017)
Dual-polarized airborne passive microwave (PM) brightness temperatures (Tb) at 6.9 GHz H/V, 19 GHz H/V and 37 GHz H/V and spaceborne active microwave (AM) X-band (9.65 GHz VV, VH) backscatter (σ0) are observed coincident to in situ snow and lake-ice
Externí odkaz:
https://doaj.org/article/b8b582516ab64df2810b4932fc66f380
Publikováno v:
Remote Sensing, Vol 9, Iss 12, p 1327 (2017)
The observed brightness temperatures (Tb) at 37 GHz from typical moderate density dry snow in mid-latitudes decreases with increasing snow water equivalent (SWE) due to volume scattering of the ground emissions by the overlying snow. At a certain poi
Externí odkaz:
https://doaj.org/article/abef7ce919e74424b33c74049d3d7d8c