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Estimation of PAR over northern China from daily NOAA AVHRR cloud cover classifications

Runnström, Micael LU ; Brogaard, Sara LU and Olsson, Lennart LU (2006) In Geocarto International 21(1). p.51-60
Abstract
Incoming Photosynthetic Active Radiation (PAR) is an essential variable for modelling aboveground primary

production of ecosystems through the light-use efficiency approach. A method is presented where daily classifications

of cloud cover (CLAVR) from the NOAA AVHRR satellite sensor is used to estimate surface incident short wave (SW)

flux from which PAR can be assessed. The study area is the Inner Mongolia Autonomous Region (IMAR) of northern

China. Daily time steps of calculated theoretical incoming global radiation outside the atmosphere, is adjusted

according to the clear, mixed or cloudy classification in the NOAA Pathfinder data set at 8x8 km grid-cells. For the

different CLAVR... (More)
Incoming Photosynthetic Active Radiation (PAR) is an essential variable for modelling aboveground primary

production of ecosystems through the light-use efficiency approach. A method is presented where daily classifications

of cloud cover (CLAVR) from the NOAA AVHRR satellite sensor is used to estimate surface incident short wave (SW)

flux from which PAR can be assessed. The study area is the Inner Mongolia Autonomous Region (IMAR) of northern

China. Daily time steps of calculated theoretical incoming global radiation outside the atmosphere, is adjusted

according to the clear, mixed or cloudy classification in the NOAA Pathfinder data set at 8x8 km grid-cells. For the

different CLAVR classifications, empirical relationships to atmospheric transparency were established against

ground measurements of SW flux. Clear pixels corresponded to an average 61% penetration of the theoretical

radiation at the top of the atmosphere and mixed and cloudy pixels to 47% and 40% respectively. The CLAVR time

series is evaluated regarding consistency and diurnal precision against measured SW flux and hours of bright

sunshine. Modelled monthly fluxes over the growing season were acceptable compared to measured (NRMSE = 6.

6%) and about as good as deriving fluxes from measurements of bright sunshine hours. The global NOAA Pathfinder

archive provides an opportunity to assess PAR over the past 20 years at a considerably higher spatial resolution than

with methods based on geo-stationary meteorological satellite data sets and without interpolations from scarce

measurements of bright sunshine hours. (Less)
Please use this url to cite or link to this publication:
author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Geocarto International
volume
21
issue
1
pages
51 - 60
publisher
Taylor & Francis
external identifiers
  • scopus:33845621553
ISSN
1010-6049
DOI
10.1080/10106040608542374
language
English
LU publication?
yes
id
63e0e514-0df8-4a7b-8bcc-1e3929018c25 (old id 701089)
date added to LUP
2016-04-04 08:54:55
date last changed
2020-01-12 20:35:49
@article{63e0e514-0df8-4a7b-8bcc-1e3929018c25,
  abstract     = {Incoming Photosynthetic Active Radiation (PAR) is an essential variable for modelling aboveground primary<br/><br>
production of ecosystems through the light-use efficiency approach. A method is presented where daily classifications<br/><br>
of cloud cover (CLAVR) from the NOAA AVHRR satellite sensor is used to estimate surface incident short wave (SW)<br/><br>
flux from which PAR can be assessed. The study area is the Inner Mongolia Autonomous Region (IMAR) of northern<br/><br>
China. Daily time steps of calculated theoretical incoming global radiation outside the atmosphere, is adjusted<br/><br>
according to the clear, mixed or cloudy classification in the NOAA Pathfinder data set at 8x8 km grid-cells. For the<br/><br>
different CLAVR classifications, empirical relationships to atmospheric transparency were established against<br/><br>
ground measurements of SW flux. Clear pixels corresponded to an average 61% penetration of the theoretical<br/><br>
radiation at the top of the atmosphere and mixed and cloudy pixels to 47% and 40% respectively. The CLAVR time<br/><br>
series is evaluated regarding consistency and diurnal precision against measured SW flux and hours of bright<br/><br>
sunshine. Modelled monthly fluxes over the growing season were acceptable compared to measured (NRMSE = 6.<br/><br>
6%) and about as good as deriving fluxes from measurements of bright sunshine hours. The global NOAA Pathfinder<br/><br>
archive provides an opportunity to assess PAR over the past 20 years at a considerably higher spatial resolution than<br/><br>
with methods based on geo-stationary meteorological satellite data sets and without interpolations from scarce<br/><br>
measurements of bright sunshine hours.},
  author       = {Runnström, Micael and Brogaard, Sara and Olsson, Lennart},
  issn         = {1010-6049},
  language     = {eng},
  number       = {1},
  pages        = {51--60},
  publisher    = {Taylor & Francis},
  series       = {Geocarto International},
  title        = {Estimation of PAR over northern China from daily NOAA AVHRR cloud cover classifications},
  url          = {http://dx.doi.org/10.1080/10106040608542374},
  doi          = {10.1080/10106040608542374},
  volume       = {21},
  year         = {2006},
}