Sentences with phrase «by natural variability rather»

Senator James Inhofe used the article as proof that climate change is caused by natural variability rather than human activity.

Not exact matches

These variations originate primarily from fluctuations in carbon uptake by land ecosystems driven by the natural variability of the climate system, rather than by oceans or from changes in the levels of human - made carbon emissions.

The problem with your statement is that 1) 1998 was a rather large outlier caused by the strongest El Nino on record, meaning the underlying trend continued unperturbed right past 1998 until ~ 2002 in that graph (the Mark I eyeball at work again), and 2) 2002 to present (and even 1998 to present) does not constitute the long term trend as 12 (or 17) years is far short of the ~ 30 * years needed to detect the underlying trend from the year to year noise of natural variability.

My understanding is that GCMs are run several times with known forcings (as far as we can determine them) but random natural variability (e.g. ENSO), so the end result is an «ensemble» of model runs characterised by mean, standard deviation etc. rather than following precisely the year - to - year variations of global temperature.

... we strongly support Delworth and Knutson's (2000) contention that this high - latitude warming event represents primarily natural variability within the climate system, rather than being caused primarily by external forcings, whether solar forcing alone (Thejll and Lassen, 2000) or a combination of increasing solar irradiance, increasing anthropogenic trace gases, and decreasing volcanic aerosols.

On shorter times scales you tend to see the stair - step progression caused by natural variability (primarily the El Niñ0 / La Niña cycles) rather than the linear trend caused by human - induced changes to the atmosphere.

The odds of this happening by chance — that is, rather than due to a combination of manmade pollution and natural climate variability — are less than 1 - in - 27 million, according to the climate research and journalism group Climate Central.

We have been focused on climate models rather than on climate dynamics and theory that is needed to understand the effects of the sun on climate, the network of natural internal variability on multiple time scales, the mathematics of extreme events, and the predictability of a complex system characterized by spatio - temporal chaos.

`... rather than on climate dynamics and theory that is needed to understand the effects of the sun on climate, the network of natural internal variability on multiple time scales, the mathematics of extreme events, and predictability of a complex system characterized by spatio - temporal chaos.

(1) to acknowledge that the AR4 conclusions are not exclusively model - based, and (2) to identify to the extent feasible major fluctuations that might compete with GHGs rather than refer to them abstractly as climate variability, so that readers can assess for themselves how important they believe these sources of variation might have been during the particular interval cited by AR4, and whether it is necessary to invoke unidentified variables to make natural variation a potent competitor to anthropogenic forcings.

If you want to incorporate any of this in your revision, the two points I would most recommend are (1) to acknowledge that the AR4 conclusions are not exclusively model - based, and (2) to identify to the extent feasible major fluctuations that might compete with GHGs rather than refer to them abstractly as climate variability, so that readers can assess for themselves how important they believe these sources of variation might have been during the particular interval cited by AR4, and whether it is necessary to invoke unidentified variables to make natural variation a potent competitor to anthropogenic forcings.