Sentences with phrase «occurred over periods of some decades»

And this didn't occur overnight, this occurred over a period of decades.

Low maximum sea ice extent also occurred over periods of some decades (e.g., mid-seventeenth and mid-eighteenth centuries, early fifteenth and late thirteenth centuries), with absolute values in some cases as low as the twentieth century ones, but these periods were in no case as persistent as in the twentieth century. . .

This is a current limitation of the models when confronted with, as yet unexplained, real world climate variations occurring over periods of decades to millennia.

Not exact matches

In addition, most of the rise from 1900 to 2010 occurred in the middle of the period, in just over one decade, and has been level the last 50 years.

Much of this change has occurred over the last several decades indicating that the warming trend accelerated over the 1925 — 2016 period.

Reconstructions of California climate suggest that meteorological droughts lasting multiple decades are not uncommon over the past 1000 years, while there is evidence that dry periods of even longer duration occurred in California's deeper geological past.

We don't compare the temperature change that occurred over the course of 1 year to the change that occurred over a 35 - year period and claim that because the 1 - year period changed by, say, 0.5 °C (like 2015 to 2016 did), that therefore we are warming at a rate o 5.0 °C per decade and this is 30 times faster than the 1979 - 2014 rate (0.12 °C per decade).

A certain amount of continued warming of the planet is projected to occur as a result of human - induced emissions to date; another 0.5 °F increase would be expected over the next few decades even if all emissions from human activities suddenly stopped, 11 although natural variability could still play an important role over this time period.12 However, choices made now and in the next few decades will determine the amount of additional future warming.

This time period is too short to signify a change in the warming trend, as climate trends are measured over periods of decades, not years.12, 29,30,31,32 Such decade - long slowdowns or even reversals in trend have occurred before in the global instrumental record (for example, 1900 - 1910 and 1940 - 1950; see Figure 2.2), including three decade - long periods since 1970, each followed by a sharp temperature rise.33 Nonetheless, satellite and ocean observations indicate that the Earth - atmosphere climate system has continued to gain heat energy.34

However, the Prudent Path authors fail to reference a recent paper (Kaufmann et al. 2009) which analyzed Arctic temperature changes over a 2000 year period (0 to 1999 AD) and concluded that «the most recent 10 - year interval (1999 - 2008) was the warmest of the past 200 decades» and that «4/5 of the warmest decades occurred during the last century».

Several analyses of ring width and ring density chronologies, with otherwise well - established sensitivity to temperature, have shown that they do not emulate the general warming trend evident in instrumental temperature records over recent decades, although they do track the warming that occurred during the early part of the 20th century and they continue to maintain a good correlation with observed temperatures over the full instrumental period at the interannual time scale (Briffa et al., 2004; D'Arrigo, 2006).

abrupt climate change occurring «over periods as short as decades or years,» which could be brought on by positive feedbacks triggered by such events as ice sheet collapse on a large scale, the collapse of part of the Gulf Stream, dieback of the Amazon forest, or coral reef die - off.

In essence, climate variability looks at changes that occur within smaller timeframes, such as a month, a season or a year, and climate change considers changes that occur over a longer period of time, typically over decades or longer.