Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Niilo Siljamo"'
Publikováno v:
Journal of Applied Meteorology and Climatology. 59:2001-2019
Snow cover plays a significant role in the weather and climate system by affecting the energy and mass transfer between the surface and the atmosphere. It also has far-reaching effects on ecosystems of snow-covered areas. Therefore, global snow-cover
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd104b10742430c3d4a6ca62464fd28a
https://doi.org/10.1175/jamc-d-20-0032.1
https://doi.org/10.1175/jamc-d-20-0032.1
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:
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
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/
Autor:
Niilo Siljamo
Publikováno v:
University of Helsinki
Snow cover plays a significant role in the weather and climate system, ecosystems and many human activities, such as traffic. Weather station snow observations (snow depth and state of the ground) do not provide high-resolution continental or global
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::f1d103d8f1d25910b364aa7c390c0680
http://hdl.handle.net/10138/317970
http://hdl.handle.net/10138/317970
Autor:
Niilo Siljamo, Tuure Karjalainen, Terhikki Manninen, Aku Riihelä, Kati Anttila, Panu Lahtinen
Publikováno v:
Journal of Geophysical Research: Atmospheres. 119:9236-9252
Seasonal snow surface roughness is an important parameter for remote sensing data analysis since it affects the scattering properties of the snow surface. To understand the phenomenon, snow surface roughness was measured near the town of Sodankyla, i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b860d1665b5436ba403a05d8ea5c425
https://doi.org/10.1002/2014jd021597
https://doi.org/10.1002/2014jd021597
Autor:
Niilo Siljamo, Otto Hyvärinen
Publikováno v:
Journal of Applied Meteorology and Climatology. 50:1275-1290
Snow cover plays an important role in the climate system by changing the energy and mass transfer between the atmosphere and the surface. Reliable observations of the snow cover are difficult to obtain without satellites. This paper introduces a new
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e8641cd51c8f237661795cc5cd716a4
https://doi.org/10.1175/2010jamc2568.1
https://doi.org/10.1175/2010jamc2568.1
Autor:
Sandra C. Freitas, Joaquin Melia, Fernando Camacho-de-Coca, Niilo Siljamo, Jean-Louis Roujean, Nicolas Ghilain, Javier Garcia-Haro, Carlos C. DaCamara, B. Geiger, Françoise Gellens-Meulenberghs, Alirio Arboleda, Isabel F. Trigo, Carla Barroso, Pedro Viterbo, Dominique Carrer, Folke Olesen, Luís Pessanha
Publikováno v:
International Journal of Remote Sensing. 32:2725-2744
Information on land surface properties finds applications in a range of areas related to weather forecasting, environmental research, hazard management and climate monitoring. Remotely sensed observations yield the only means of supplying land surfac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c4253b6b9038632d4b0535cb9745835
https://doi.org/10.1080/01431161003743199
https://doi.org/10.1080/01431161003743199
Publikováno v:
Journal of Applied Meteorology and Climatology. 48:1199-1216
Snow cover has a strong effect on the surface and lower atmosphere in NWP models. Because the progress of in situ observations has stalled, satellite-based snow analyses are becoming increasingly important. Currently, there exist several products tha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a58612bbeaa5179cb6cb9e005bf9bba6
https://doi.org/10.1175/2008jamc2069.1
https://doi.org/10.1175/2008jamc2069.1
Publikováno v:
IGARSS
This article presents some results from the snow surface roughness measurements that were made during the Snow Reflectance Transition Experiment -campaign in Sodankyla, Finnish Lapland, in 2009 and 2010. The surface roughness was measured with a phot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7263b57629be27892f2483f89f1fac12
https://doi.org/10.1109/igarss.2012.6352525
https://doi.org/10.1109/igarss.2012.6352525