scholarly journals AVHRR-based Polar Pathfinder products for modeling applications

1997 ◽  
Vol 25 ◽  
pp. 388-392 ◽  
Author(s):  
James Maslanik ◽  
Charles Fowler ◽  
Jeffrey Key ◽  
Ted Scambos ◽  
Todd Hutchinson ◽  
...  
Keyword(s):  
High Resolution ◽  
Surface Temperature ◽  
Surface Albedo ◽  
Cloud Fraction ◽  
Ancillary Data ◽  
Clear Sky ◽  
Process Studies ◽  
Very High ◽  
Temperature Surface

A suite of Arctic and Antarctic products is being prepared from Advanced Very High Resolution Radiometer (AVHRR) and ancillary data as part of NASA’s Polar Pathfinder effort. These products consist of twice-daily gridded fields of clear-sky surface temperature, surface albedo and cloud fraction, as well as daily ice velocities, for 1983–96. The products and their production methodology are summarized here, with examples demonstrating applications of the Pathfinder products for process studies and modeling.

scholarly journals AVHRR-based Polar Pathfinder products for modeling applications

1997 ◽  
Vol 25 ◽  
pp. 388-392 ◽  
Author(s):  
James Maslanik ◽  
Charles Fowler ◽  
Jeffrey Key ◽  
Ted Scambos ◽  
Todd Hutchinson ◽  
...  
Keyword(s):  
High Resolution ◽  
Surface Temperature ◽  
Surface Albedo ◽  
Cloud Fraction ◽  
Ancillary Data ◽  
Clear Sky ◽  
Process Studies ◽  
Very High ◽  
Temperature Surface

A suite of Arctic and Antarctic products is being prepared from Advanced Very High Resolution Radiometer (AVHRR) and ancillary data as part of NASA’s Polar Pathfinder effort. These products consist of twice-daily gridded fields of clear-sky surface temperature, surface albedo and cloud fraction, as well as daily ice velocities, for 1983–96. The products and their production methodology are summarized here, with examples demonstrating applications of the Pathfinder products for process studies and modeling.

scholarly journals Model-dependence of the CO<sub>2</sub> threshold for melting the hard Snowball Earth

2011 ◽  
Vol 7 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Y. Hu ◽  
J. Yang ◽  
F. Ding ◽  
W. R. Peltier
Keyword(s):  
Surface Temperature ◽  
Greenhouse Effect ◽  
Surface Albedo ◽  
Snowball Earth ◽  
Pressure Broadening ◽  
Near Surface ◽  
Induced Absorption ◽  
Cloud Forcing ◽  
Clear Sky ◽  
Convective Model

Abstract. One of the critical issues of the Snowball Earth hypothesis is the CO2 threshold for triggering the deglaciation. Using Community Atmospheric Model version 3.0 (CAM3), we study the problem for the CO2 threshold. Our simulations show large differences from previous results (e.g. Pierrehumbert, 2004, 2005; Le Hir et al., 2007). At 0.2 bars of CO2, the January maximum near-surface temperature is about 268 K, about 13 K higher than that in Pierrehumbert (2004, 2005), but lower than the value of 270 K for 0.1 bar of CO2 in Le Hir et al. (2007). It is found that the difference of simulation results is mainly due to model sensitivity of greenhouse effect and longwave cloud forcing to increasing CO2. At 0.2 bars of CO2, CAM3 yields 117 Wm−2 of clear-sky greenhouse effect and 32 Wm−2 of longwave cloud forcing, versus only about 77 Wm−2 and 10.5 Wm−2 in Pierrehumbert (2004, 2005), respectively. CAM3 has comparable clear-sky greenhouse effect to that in Le Hir et al. (2007), but lower longwave cloud forcing. CAM3 also produces much stronger Hadley cells than that in Pierrehumbert (2005). Effects of pressure broadening and collision-induced absorption are also studied using a radiative-convective model and CAM3. Both effects substantially increase surface temperature and thus lower the CO2 threshold. The radiative-convective model yields a CO2 threshold of about 0.21 bars with surface albedo of 0.663. Without considering the effects of pressure broadening and collision-induced absorption, CAM3 yields an approximate CO2 threshold of about 1.0 bar for surface albedo of about 0.6. However, the threshold is lowered to 0.38 bars as both effects are considered.

scholarly journals A 40-year global dataset of visible channel remote sensing reflectances and coccolithophore bloom occurrence derived from the Advanced Very High Resolution Radiometer catalogue

2018 ◽  
Author(s):  
Benjamin R. Loveday ◽  
Timothy Smyth
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Atmospheric Correction ◽  
Global Ocean ◽  
Climate Data ◽  
Ancillary Data ◽  
Remote Sensing Reflectance ◽  
Data Files ◽  
Climate Data Record ◽  
Very High

Abstract. A consistently calibrated 40-year length dataset of visible channel remote sensing reflectance has been derived from the Advanced Very High Resolution Radiometer (AVHRR) sensor global time-series. The dataset uses as its source the Pathfinder Atmospheres – Extended (PATMOS-x) v5.3 Climate Data Record (CDR) for top-of-atmosphere (TOA) visible channel reflectances. This paper describes the theoretical basis for the atmospheric correction procedure and its subsequent implementation, including the necessary ancillary data files used and quality flags applied, in order to determine remote sensing reflectance. The resulting dataset is produced at daily, and archived at monthly, resolution, on a 0.1° × 0.1° grid at https://doi.pangaea.de/10.1594/PANGAEA.892175. The primary aim of deriving this dataset is to highlight regions of the global ocean affected by highly reflective blooms of the coccolithophorid Emiliania Huxleyi over the past 40 years.

scholarly journals The Global Trend in Sea Surface Temperature from 20 Years of Advanced Very High Resolution Radiometer Data

2007 ◽  
Vol 20 (7) ◽  
pp. 1255-1264 ◽  
Author(s):  
S. A. Good ◽  
G. K. Corlett ◽  
J. J. Remedios ◽  
E. J. Noyes ◽  
D. T. Llewellyn-Jones
Keyword(s):  
Time Series ◽  
High Resolution ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
El Nino ◽  
Sea Surface ◽  
Mount Pinatubo ◽  
Global Trend ◽  
Very High ◽  
Linear Trends

Abstract The trend in sea surface temperature has been determined from 20 yr of Advanced Very High Resolution Radiometer Pathfinder data (version 5). The data span the period from January 1985 to December 2004, inclusive. The linear trends were calculated to be 0.18° ± 0.04° and 0.17° ± 0.05°C decade−1 from daytime and nighttime data, respectively. However, the measured trends were found to be somewhat smaller if version 4.1 of the Pathfinder data was used, or if the time series of data ended earlier. The influence of El Niño on global temperatures can be seen clearly in the data. However, it was not found to affect the trend measurements significantly. Evidence of cool temperatures after the eruption of Mount Pinatubo in 1991 was also observed.

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