Sentences with word «geopotential»

The below normal / cold PCHs in the troposphere are consistent with the negative geopotential height anomalies predicted across the Arctic and the positive AO for the coming week (Figure 1).

More seasonably cool temperatures are expected in Northeastern Canada (Figure 3) where troughing / negative geopotential height anomalies are predicted to persist (Figure 2).

East Asian ridging / positive geopotential height anomalies are predicted to persist (Figure 2).

For example figure 7 is the 6 — 10 day outlook for 15 — 19 August, made on 9 August 2008, for 500 hPa geopotential height field (solid) and anomalies (dashed, DNS = departure from normal); earlier weather outlooks in August were similar.

One, called the polar cap geopotential height anomaly, or PCH, is essentially a measure of troughs and ridges in pressure in the upper atmosphere — the high and low pressure zones familiar from television news.

The projection of 500mb geopotential height (see Figure 10) for the remainder of July continues the June - to - early July SLP pattern (see Figure 9) with support for low SLP over the Pacific Arctic.

There are many methods used to define the position of the extratropical storm tracks, probably the most common being to plot the variance of the 500 - mb geopotential height field.

This geographically vast area of unusually high geopotential heights has been extraordinarily persistent over the past 12 months and has also been a common feature in recent dry years (including, notably, the 2011 - 2012 winter season).

Polar Cap Height (PCH)- Is the area averaged geopotential height anomaly averaged over every grid point from 60 ° N to the North Pole and from the surface through the stratosphere (typically 10 hPa).

Specifically, in the simulations we record daily surface temperature, precipitation, 500hPa geopotential height and surface winds over the Atlantic - European region.

Recent boreal winters have exhibited a large - scale seesaw temperature pattern characterized by an unusually warm Arctic and cold continents... Using a recently developed index of severe winter weather, we show that the occurrence of severe winter weather in the United States is significantly related to anomalies in pan-Arctic geopotential heights and temperatures.

In climate research, the intensity of a storm track is often measured by the band pass filtered eddy kinetic energy, geopotential variance or related variables.

It's possible that they use altitude as vertical coordinate in a situation where geopotential height would be more appropriate.

In some rough order of certainty we can consider that the 11 year solar cycle impacts on the following are well accepted: stratospheric ozone, cosmogenic isotope production, upper atmospheric geopotential heights, stratospheric temperatures and (slightly less certain and with small magnitudes ~ 0.1 deg C) tropospheric and ocean temperatures.

I've discussed fairly extensively in previous posts (here and here) the structure of the highly persistent and amplified geopotential height ridging over the Gulf of Alaska that began in December 2012 and has continued up to the present.

Immediately apparent is the prominence of a broad region of anomalous geopotential height ridging over the northeastern Pacific Ocean.

Warm conditions are currently being experienced as mild offshore flow and persistent geopotential height ridging allow for a weak storm track across the Eastern Pacific.

A quick check of recent data suggests that the same spatial pattern of anomalously strong geopotential height ridging in the Gulf of Alaska continued through the month of November and will proabably continue for at least a while still.

High pressure tends to inhibit rainfall by suppressing the vertical motions in the atmosphere necessary for the development of clouds and storm systems, while geopotential ridging acts to shift the storm track northward and to divert existing storm systems away from California.

* In fact, the region of historically unprecedented (since at least 1948) annual - scale geopotential height anomalies associated with the Triple R extend over a truly vast geographic region — from central California westward across the entire North Pacific to the Kamchatka Peninsula in the Russian Far East.

With weak geopotential height anomalies predicted across the Arctic (Figure 5b) the AO is forecasted to remain neutral to slightly positive (Figure 1).

Still the predominance ofabove normal geopotential height anomalies will result in normal to above normal temperatures for much of North America including Alaska, Canada the Lower 48 (Figure 8).

This positive trend in Greenland summer blocking is likely responsible for downstream troughing and relatively normal to cool temperatures across Northwestern Europe including the UK seen in Figure i. Currently Greenland is dominated by deep troughing / relatively low geopotential heights.

Ridging / positive geopotential height anomalies currently dominate western North America and are predicted to persist for the remainder of the week (Figure 2).

The PNA (left) and NAO (right) teleconnection patterns, shown as one - point correlation maps of 500 hPa geopotential heights for boreal winter (DJF) over 1958 to 2005.

The first two are called the polar cap geopotential height anomaly (PCH) index and the polar cap air temperature anomaly (PCT) index.

The white region on this map plot depicts the areas where 500mb geopotential heights during 2013 were unprecedented (higher than any previous value since at least 1948).

* Extremely high geopotential heights (a vertically aggregated measure of atmospheric temperature) over the northeastern Pacific Ocean are historically linked to very low precipitation in California.