tag:blogger.com,1999:blog-9093436161326155359.post8409278501557053988..comments2024-03-29T09:21:04.576+00:00Comments on Variable Variability: Upcoming meetings on climate data qualityVictor Venemahttp://www.blogger.com/profile/02842816166712285801noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-9093436161326155359.post-63266246831577154192016-03-31T19:39:51.492+01:002016-03-31T19:39:51.492+01:00Victor
Good luck with this intriguing project. Ye...Victor<br /><br />Good luck with this intriguing project. Yes, the problem at our local resort was that they stayed with the old (and reliable) equipment whilst the rival resort had the newest. When the newspaper reported that they were the sunniest place in the country two days in a row whilst our resort was merely bright I drove the four miles there the next day, saw it was merely bright, but sure enough it was reported that there had been some relight hours of sunshine! <br /><br />When reading a US weather review journal from around 1880 I noticed there was an article from the weather observers where they noted that one type of thermometer was consistently warmer than another by several degrees.<br /><br />Trying to make sense of these biases must be problematic.<br /><br />Tonyb<br /><br />Tonybhttp://climatereason.comnoreply@blogger.comtag:blogger.com,1999:blog-9093436161326155359.post-69819534583008130542016-03-31T16:14:55.528+01:002016-03-31T16:14:55.528+01:00Tony, yes, it will be difficult. That is also why ...Tony, yes, it will be difficult. That is also why it has not been done before. The marine observations are also typically made by volunteers. We may have to compute the temperature on days that the wind comes from the sea. Biases are no problem for trends, only changes in biases.<br /><br />The trend in the land surface temperature is also different from the trend in sea surface temperature. Not sure how large this difference is at the coast. Possibly we need to use methods that do not adjust small trend differences. Let's see if we can get it working.<br /><br />I was thinking of official weather stations. In Germany we have a weather company that prefers to put its stations at bad locations so that they can get into the news more often with record values. I think they also often work for tourist agencies.<br /><br />Especially estimates of sun shine duration vary enormously between Campbell Stokes observations and modern radiation measurements. Victor Venemahttps://www.blogger.com/profile/02842816166712285801noreply@blogger.comtag:blogger.com,1999:blog-9093436161326155359.post-63092794528890655422016-03-30T21:13:07.198+01:002016-03-30T21:13:07.198+01:00Your comment that there are a decent number of wea...Your comment that there are a decent number of weather stations on the coast and they could usefully be compared to marine observations is interesting. <br /><br />I live very close to the English south coast and have two such stations very close by. For there to be a useful comparison the methodology, instrumentation and observation quality must be similar. <br /><br />I wonder if a properly trained marine observer ( excluding taking SST's) is superior to the amateurs commonly taking coastal records with, in certain eras, pressure from the tourist board to produce 'good' weather? <br /><br />Add to this the bias of the instrumentation. I had an example of this when I noticed that our 'rival' resort down the coast was , all of a sudden, much sunnier and warmer than ours. There was some debate in the Daily telegraph about this and it turned out that the rival resort had purchased new equipment in order to meet new met office specifications. These would record, for example, what was no more than a day with some brightness, as a mostly sunny day. Temperatures also leapt up by up to a degree. <br /><br />So correlating coastal and marine observations sounds worthwhile but I do wonder if you might be comparing apples and oranges unless a check on the quality of the data can be made<br /><br />TonybTonybhttp://climatereason.comnoreply@blogger.com