Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Emmihenna Jääskeläinen"'
Publikováno v:
International Journal of Applied Earth Observations and Geoinformation, Vol 107, Iss , Pp 102701- (2022)
Surface albedo is a necessary parameter for climate studies and modeling. There is a need for a full spatial coverage of albedo data, but clouds and high solar zenith angle cause missing values to the optical satellite products, especially around the
Externí odkaz:
https://doaj.org/article/4b0682e951f348cba29589c1fb2573e7
Publikováno v:
Canadian Journal of Remote Sensing, Vol 45, Iss 3-4, Pp 350-367 (2019)
The relationship of black-sky and white-sky albedo values of snow-covered terrain is studied using empirical measurements of six BSRN sites and the Finnish Meteorological Institute Sodankylä site, where albedo measurements are carried out both in an
Externí odkaz:
https://doaj.org/article/3dd5d8f508c543f2b210c91744dcbe6a
Publikováno v:
Remote Sensing, Vol 10, Iss 10, p 1619 (2018)
The rapid warming of the Northern Hemisphere high latitudes and the observed changes in boreal forest areas affect the global surface albedo and climate. This study looks at the trends in the timing of the snow melt season as well as the albedo level
Externí odkaz:
https://doaj.org/article/c3f51c4d597544ebad79a340b2a263fa
Publikováno v:
Remote Sensing, Vol 9, Iss 11, p 1095 (2017)
Atmospheric effects, especially aerosols, are a significant source of uncertainty for optical remote sensing of surface parameters, such as albedo. Also to achieve a homogeneous surface albedo time series, the atmospheric correction has to be homogen
Externí odkaz:
https://doaj.org/article/b2c56f18e5fb4d3cb4f53d57111ba590
This paper describes a new method for cloud-correcting observations of black-sky surface albedo derived using the Advanced Very High Resolution Radiometer (AVHRR). Cloud cover constitutes a major challenge for surface albedo estimation using AVHRR da
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9645360cad372f478c2e3be64dfdec8a
http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-6233
http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-6233
Autor:
Hannu Marttila, Annalea Lohila, Aleksi Räsänen, Mika Korkiakoski, Filip Muhic, Tarmo Virtanen, Pauliina Liwata-Kenttala, Pertti Ala-aho, Terhikki Manninen, Pekka Hänninen, Emmihenna Jääskeläinen, Mira Markovaara-Koivisto, Raimo Sutinen
A soil moisture estimation method was developed for Sentinel-1 synthetic aperture radar (SAR) ground range detected high resolution (GRDH) data to analyze moisture conditions in a gently undulating and heterogeneous subarctic area containing forests,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::97420c21bd7df1e1e2210215702d1661
http://urn.fi/urn:nbn:fi-fe2022030822381
http://urn.fi/urn:nbn:fi-fe2022030822381
Autor:
Terhikki Manninen, Jean-Louis Roujean, Olivier Hautecoeur, Aku Riihelä, Panu Lahtinen, Emmihenna Jääskeläinen, Niilo Siljamo, Kati Anttila, Timo Sukuvaara, Lauri Korhonen
Publikováno v:
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres, 2022, 127, ⟨10.1029/2021JD035376⟩
Journal of Geophysical Research: Atmospheres, 2022, 127, ⟨10.1029/2021JD035376⟩
Helicopter based simultaneous measurements of broadband surface albedo and the effective leaf area index (LAIeff) were carried out in subarctic area of Finnish Lapland in spring 2008, 2009, and 2010 under varying illumination and snow cover condition
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e517e6d9059f988e230b4a1fc1b9b32a
http://hdl.handle.net/10138/351136
http://hdl.handle.net/10138/351136
Publikováno v:
Journal of Applied Meteorology and Climatology. 59:1415-1428
Surface albedo, the fraction of incoming solar radiation reflected hemispherically by the surface, is an essential climate variable (ECV) directly related to the energy budget of Earth. The presence and properties of snow cover alter surface albedo s
Cloud cover constitutes a major challenge for the surface albedo estimation using Advanced Very High Resolution Radiometer AVHRR data for all possible conditions of cloud fraction and cloud type on any land cover type and solar zenith angle. Cloud ma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc4add2535bbe64c78f7e79076e3fbe6
https://amt.copernicus.org/preprints/amt-2021-143/
https://amt.copernicus.org/preprints/amt-2021-143/
Publikováno v:
Canadian Journal of Remote Sensing. 45:350-367
The relationship of black-sky and white-sky albedo values of snow-covered terrain is studied using empirical measurements of six BSRN sites and the Finnish Meteorological Institute Sodankyl...