Sentences with phrase «sea level trend estimates»

Global sea level trend estimates from the four satellite datasets.

Global sea level trend estimates from the merged satellite datasets.

Not exact matches

[Response: Current trends in sea level rise are larger (> 3mm / year), and estimates of future changes rely on more that the excel linear regression routine.

> A new comment on the post # 74 «Michael Crichton's State of Confusion» is > waiting for your approval > > Author: Hans Erren -LRB--RRB- > E-mail: erren21 @... > URL: > Whois:... > Comment: > Sea - level rise > > Although satellite data (TOPEX / POSEIDON (sic) and JASON) shows a much > steeper trend over recent years (2.8 mm / yr) than the long term mean > estimates from tide gauges (1.7 to 2.4 mm / yr), each method compared to > itself does not indicate an accelleration.

Given the previous sea - level trend estimate of about 1.5 mm / y, there is a gap that requires either that these two components both be at the high end of projections or that there is a significant contribution from Antarctica and / or Greenland.

Arbetter, 4.7, Statistical A statistical model using regional observations of sea ice area and global NCEP air temperature, sea level pressure, and freezing degree day estimates continues the trend of projecting below - average summer sea ice conditions for the Arctic.

We interpret the split of 2013 Outlooks above and below the 4.1 level to different interpretations of the guiding physics: those who considered that observed sea ice extent in 2012 being well below the 4.1 level indicates a shift in arctic conditions, especially with regard to reduced sea ice thickness and increased sea ice mobility; and those who have estimates above 4.1 who support a return to the longer - term downward trend line (1979 - 2007).

We interpret the split of 2013 Outlooks above and below the 4.1 median to different interpretations of the guiding physics: those who considered that observed sea ice extent in 2012 being well below the 4.1 level indicates a shift in arctic conditions, especially with regard to reduced sea ice thickness and increased sea ice mobility; and those with estimates above 4.1 who support a return to the longer - term downward trend line (1979 - 2007).

Several other satellite altimeters have also been launched, and the data from these have been used to estimate global mean sea level trends since 1993.

However, as we have seen throughout this section, the tidal gauge estimates the IPCC used to estimate global sea level trends are contaminated by local trends, such as tectonic activity, post-glacial rebound... and the coastal subsidence that Syvitski et al. identified!

In the next section, we will discuss why the first factor can seriously bias estimates of global sea level trends.

In order to use tidal gauges to reliably estimate global sea level changes, researchers have to successfully separate the components of shifting land heights and local sea level variability from any global trends.

Despite the various problems with the tidal gauge data, it is possible that the various estimates of global sea level trends of 1 - 2 or maybe 2 - 3 mm / year might coincidentally be correct.

«Trends and acceleration in global and regional sea levels since 1807» «Evaluation of the global mean sea level budget between 1993 and 2014» «Considerations for estimating the 20th century trend in global mean sea level» «New estimate of the current rate of sea level rise from a sea level budget approach» «Reassessment of 20th century global mean sea level rise» «The increasing rate of global mean sea - level rise during 1993 — 2014» «Unabated global mean sea - level rise over the satellite altimeter era» «An increase in the rate of global mean sea level rise since 2010»

Figure 3: «Considerations for estimating the 20th century trend in global mean sea level» Figure 1B: «Reassessment of 20th century global mean sea level rise» «Recent global sea level acceleration started over 200 years ago?»

IPCC synthesis reports offer conservative projections of sea level increase based on assumptions about future behavior of ice sheets and glaciers, leading to estimates of sea level roughly following a linear upward trend mimicking that of recent decades.

After removing an estimate of land - level change, error - in - variables changepoint analysis of the decompacted and original sea - level reconstructions identified three trends.

The uncertainty in the global mean sea level trend is estimated to be of ± 0.5 mm / yr in a confidence interval of 90 % (1.65 sigma), whereas the uncertainty of the regional mean sea level trends is of the order of 2 - 3 mm / yr with values as low as 0.5 mm / yr or as high as 5.0 mm / yr depending on the region considered (Legeais et al., 2018, under review).

Bouin, Z. Altamimi Geocentric sea - level trend estimates from GPS analyses at relevant tide gauges world - wide Global and Planetary Change 57 (2007) 396 — 406 made a correct recalibration with the ITRF (International Terrestrial Reference Frame) defined by the International Earth Rotation Service

Last August, I wrote about what that near - term worse case scenario might look like: Should its melt rate continue to trend above previous estimates, Antarctica may produce an extra foot of sea level rise by 2100, which would pose a threat to low - lying coastal areas worldwide.

Statistically significant trends obtained from records longer than 40 years yielded sea - level - rise estimates between 1.06 — 1.75 mm / yrear - 1, with a regional average of 1.29 mm yr - 1, when corrected for global isostatic adjustment (GIA) using model data, with a regional average of 1.29 mm - 1..

Due to the extreme rate of CO ₂ and temperature rise during the 20th century relative to earlier events and the non-linearity of climate change trends the timing of sea level rise may be difficult to estimate.

The range of possible sea levels obtained by combining all individual estimates in various combinations (total 144 combinations) suggested that the observed sea levels lie at the very edge of the range and a residual trend is needed to make up for the discrepancy, selecting the largest or smallest estimates for individual contributors.

Table 11.9 of the TAR listed several estimates for global and regional 20th - century sea level trends based on the Permanent Service for Mean Sea Level (PSMSL) data set (Woodworth and Player, 200sea level trends based on the Permanent Service for Mean Sea Level (PSMSL) data set (Woodworth and Player, 2level trends based on the Permanent Service for Mean Sea Level (PSMSL) data set (Woodworth and Player, 200Sea Level (PSMSL) data set (Woodworth and Player, 2Level (PSMSL) data set (Woodworth and Player, 2003).