billw55, on 2015-June-09, 14:29, said:
1. I understand all that.
2. Sea level rise from global warming is mostly due to thermal expansion of ocean water, not melting ice.
3. True, higher sea levels are likely to exacerbate the coastal effects of hurricanes. Nevertheless, the occurrence and path of this particular hurricane is unrelated to climate change. Indeed, we are in a period of unusually good luck on US hurricane strikes .. which also has no bearing on the fact climate change.
My main point is that using bad examples makes a case sound weaker, not stronger. Climate change is no exception. Hurricane Sandy is a bad example.
Bill,
Agreed. Sea level has been rising at a fairly constant rate (3 mm/yr based on satellite imagery and 2.5 mm/yr based on tidal gauges) for the last century. Should this continue, sea level will rise another 10-12" by the year 2100. This might affect coastal erosion, but have little effect on huricanes.
Hurricanes hitting New York is not a new occurrence. During the late 19th and early 20th century, New York was hit by several hurricanse. Prior to Sandy, the residents of the Big Apple experienced a rather long streak of near misses. That ended with Sandy, whose main damaged occurred not because it was a particularly strong hurricane (minimal cat. 1), but its timing. It struck at high tide, during a full moon, and in conjunction with an approaching strong cold front (a la "The Perfect Storm"). Combine that with a direct hit on Manhatten, and you have the devastation that occurred. This was in no way related to climate change, although there are those who like to point to every weather event as evidence thereof, as if these events have not ocurred repeatedly in the past.
A similar opinion is occurring in California with their "historic drought." Science has shown a history of much longer and more severe droughts occurring in the Golden State over the past millenium. The 20th century was an anomaly, as rainfall was much more abundant than in past times. The Great Drought of the 1860s brought the gold-rush economy to a standstill, as most crops and livestock were wiped out, and farmers went bankrupt. Historically, droughts decrease as the world warms. This is due to the higher rainfall associataed with higher temperatures. Globally, drought has decreased since the recent warming trend began. The California drought was not caused by higher temperatures, but a persistent high-pressure ridge over the eastern Pacific Ocean. Some claim that will be a common occurrence with rising temperatures, but others contend otherwise. The only known man-made contribution to the drought was the poor water management by the residents there.