Comments on: Review of Antarctic Snowfall

By: film izle

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By: davids99us

davids99us — Sun, 28 Feb 2010 12:32:32 +0000

David,I really didn't spend much time on how I would analyse it, and yes I think that using EMD and seeing if the upturn in snowfall was predicted would be the way I would go.

By: DavidLHagen

DavidLHagen — Sun, 28 Feb 2010 07:50:27 +0000

Prof. Emeritus Will Alexander shows a 21 year solar periodicity in the hydrometerological data in South Africa. e.g., A critical assessment of current climate change science W.J.R. Alexander 2006.See especially page 25 "Figure 2. Characteristics of the periodic sequences of river flow at representative dam sites. The double sunspot cycle is diagrammatically superimposed."This periodicity might be evident in the Antartic snowfall.

By: Anonymous

Anonymous — Sun, 28 Feb 2010 07:32:00 +0000

David,
I really didn’t spend much time on how I would analyse it, and yes I think that using EMD and seeing if the upturn in snowfall was predicted would be the way I would go.

By: davids99us

davids99us — Sun, 28 Feb 2010 06:32:32 +0000

David,I really didn't spend much time on how I would analyse it, and yes I think that using EMD and seeing if the upturn in snowfall was predicted would be the way I would go.

By: Anonymous

Anonymous — Sun, 28 Feb 2010 02:50:00 +0000

Prof. Emeritus Will Alexander shows a 21 year solar periodicity in the hydrometerological data in South Africa. e.g., A critical assessment of current climate change science W.J.R. Alexander 2006. See especially page 25 "Figure 2. Characteristics of the periodic sequences of river flow at representative dam sites. The double sunspot cycle is diagrammatically superimposed." This periodicity might be evident in the Antartic snowfall.

By: DavidLHagen

DavidLHagen — Sun, 28 Feb 2010 01:50:27 +0000

By: Anonymous

Anonymous — Sat, 27 Feb 2010 06:30:00 +0000

I would think that generally a log-normal distribution would be good for precipitation total (with exponential tails),

but in this case its anomalies, so the mean is zero. The anomalies are normal by the tests, so I am OK with that. There is also the troubling issue of the anomalies alternating +ve and -ve, so the degrees of freedom have to be less. I just don’t like smoothing. It introduces too many problems.

By: Geoff Sherrington

Geoff Sherrington — Sat, 27 Feb 2010 05:58:00 +0000

Are there not problems with distributions (apart from your observation that the recent event is incomplete) because of the possibility of zero precipitation? Perhaps not here, but there are plenty of places with zero annual precipitation. Also, sublimation is a process that enters the estimation of precipitation at Law Dome. I am unsure if it is accounted for (as by use of isotopes or dust density) but if not, then it would compound the problem because the remnant layer thickness would depend not only on how much was put down, but also on how much was wafted off – and the latter is hard to estimate and separate from the paramaters sought.

By: davids99us

davids99us — Sat, 27 Feb 2010 05:30:56 +0000

I would think that generally a log-normal distribution would be good for precipitation total (with exponential tails), but in this case its anomalies, so the mean is zero. The anomalies are normal by the tests, so I am OK with that. There is also the troubling issue of the anomalies alternating +ve and -ve, so the degrees of freedom have to be less. I just don't like smoothing. It introduces too many problems.