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Wednesday, April 22, 2020 | History

2 edition of Melting influences on the computer forecast of wind drift and concentration of sea ice found in the catalog.

Melting influences on the computer forecast of wind drift and concentration of sea ice

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Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Oceanography

  • Edition Notes

    ContributionsNaval Postgraduate School (U.S.)
    The Physical Object
    Pagination1 v. :
    ID Numbers
    Open LibraryOL25158674M

      Sea ice is melting earlier in the spring and freezing later in the autumn. Each summer it thins more and recedes further, leaving greater expanses of the ocean exposed to hour sunlight.   The floating ice displaces water, so melting it doesn't change the sea level, but it does mess up the salinity on a local level. It also drastically changes the albedo (reflectivity) of the planet so that more solar energy is absorbed (rather than reflected back into space by the white ice.   Figure 5. Variation of date of sea ice minimum also shows a change of trend in Source: Greg Goodman at Climate Etc. The shortening of the melting season is not the only evidence besides sea ice extent and age that something new is going on in the Arctic since


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Melting influences on the computer forecast of wind drift and concentration of sea ice by Kenneth M. Irvine Download PDF EPUB FB2

Melting influences on the computer forecast of wind drift and concentration of sea ice. by Irvine, Kenneth Melting influences on the computer forecast of wind drift and concentration of sea ice book Enter the password to open this PDF file: Cancel OK.

File name:. Melting influences on the computer forecast of wind drift and concentration of sea ice. Approved for public release; distribution is unlimitedKnodle has developed a computer program to provide five-day forecasts of the wind drift and concentration of sea-ice [1].One of the problems not considered in the program is the effect of melting.

Melting influences concentration in two ways. It reduces the amount of ice directly, and changes in thickness and concentration change the wind drift Author: Kenneth M. Irvine. Melting influences on the computer forecast of wind drift and concentration of sea ice Year: OAI identifier: oai: With the ability to continuously monitor sea-ice conditions from space starting in the early s, it has been known that Antarctic sea ice exhibits high regional and seasonal variability resulting from a complex interplay between atmospheric and oceanic forcing (e.g., Zwally et al., ).Here, we focus specifically on how winds, sea-ice drift, sea-surface temperature, and precipitation Cited by: While apparently less influential on sea ice extent and SST, wind stress plays a key role in sea ice motion, thickening coastal sea ice, and thinning and decreasing the concentration of ice in mid.

ACNFS is designed to provide short term, 1–7 day forecasts of Arctic sea ice and ocean conditions. Many quantities are forecast by ACNFS; the most commonly used include ice concentration, ice thickness, ice velocity, sea surface temperature, sea surface salinity, and sea surface velocities.

Holland and Kwok () found the vector correlation between the sea ice drift and m wind to be low above the shelf in the Weddell Sea and in the western parts of the Ross Sea.

To date, most climate related sea-level rise can be attributed to A. thermal expansion of ocean water. melting ice sheets. melting glaciers. the draining of the Great Lakes.

increased runoff due to more severe thunderstorms and monsoons. Due to the ice-albedo feedback, a reduction in sea ice due to a warming climate A) generates sulfate aerosols which can warm the climate. B) leads to an increase in oceanic areas covered by ice.

C) leads to enhanced warming. D) leads to reduced warming. Ice blown out of the region by Arctic winds can explain around one-third of the steep downward trend in sea ice Melting influences on the computer forecast of wind drift and concentration of sea ice book in the region sincethe scientists say.

The study does not question that global warming is also melting ice in the Arctic, but it. ACNFS is designed to provide short term, day forecasts of Arctic sea ice and ocean conditions.

Many quantities are forecast by ACNFS; the most commonly used include ice concentration. Known as MASAM2, this sea ice concentration is a blend of two other daily sea ice data products. First is ice coverage from MASIE, the Multisensor Analyzed Sea Ice Extent product, at a 4 km grid cell size.

Second are ice concentrations from the Advanced Microwave Scanning Radiometer 2 (AMSR2) at a 10 km grid cell size. Medium-term forecast of the Arctic sea-ice. Sincewe have released the Melting influences on the computer forecast of wind drift and concentration of sea ice book forecast in the summer Arctic.

For this forecast, daily ice-velocity, ice concentration, and ice thickness products are prepared using data by satellite passive-microwave sensors. The aim of this study is to provide a reanalysis from to assimilating sea surface temperature, sea ice concentration and sea ice drift.

In the following it is also shown how surface winds in the Southern Ocean can be improved using sea ice drift estimated from infrared by:   Wind-driven changes in ice motion are clearly linked to changes in ice concentration.

a, Ice-motion trend vectors overlaid on ice-concentration trends. b, ERA-Interim m wind trend vectors overlaid on trend in sea-level pressure. White, grey and black contours show underlay field trends significant at 90%, Cited by: Apart from melting, the southward drift through Fram Strait is the main ice loss mechanism.

We present high resolution sea ice drift data across 79° N from to   Despite regional melting, total Antarctic sea ice has been expanding over the past 35 years 1,2, changes have an impact on surface albedo and Cited by: Thin ice •%, thin (sea ice will be systematically retrieved as lower concentration of sea ice.

•%, thin (>20cm. A global sea ice–ocean model is used to examine the impact of wind intensification on Antarctic sea ice volume. Based on the NCEP–NCAR reanalysis data, there are increases in surface wind speed (% yr −1) and convergence (% yr −1) over the ice-covered areas of the Southern Ocean during the period –Driven by the intensifying winds, the model simulates an increase Cited by: Recent Sea Ice Data Assimilation Research at ECCC Andrea Scott University of Waterloo Toward the assimilation of high-resolution sea ice observations Giovanni Ruggiero Mercator Ocean Assimilation of sea-ice concentration into a multi-category sea-ice model using an Ensemble Kalman Filter CoffeeFile Size: KB.

Sea ice in the Arctic has decreased dramatically since the late s, particularly in summer and autumn. Since the satellite record began inthe yearly minimum Arctic sea ice extent (which occurs in September) has decreased by about 40% [Figure 5]. Ice cover expands again each Arctic winter, but the ice is thinner than it used to be.

The wind blowing on the top surface of the sea ice results in a drag force on the ice surface and causes the ice to drift. The amount of the force depends on the speed of the wind and the characteristics of the sea ice surface.

A rough ice surface is affected more by the wind than a smooth surface. About the forces melting the arctic sea ice (not just CO2). What we learned from the freak storm that “melted the North Pole” on 30 December Books about the state of climate science.

According to the Fifth Assessment Report from the Intergovernmental Panel on Climate Change (IPCC), annual Arctic sea ice extent (SIE) is very likely (90%–% confident) to have decreased at a rate of to million km 2 decade −1 during the – period (Vaughan et al. ), leading to projections of a summer ice free Arctic by the s (Wang and Overland ).Cited by: The skill in both MO and SIC forecasts thus appears to be driven, in‐part, by capturing the location of the spring ice edge and an open water positive feedback loop within the ice pack (in the SIC forecast): increased open water due to sea ice loss reduces the surface albedo, causing further absorption of solar radiation and sea surface Cited by: [1] We examine the spatial trends in Arctic sea ice drift speed from satellite data and the role of wind forcing for the winter months of October through May.

Between andthe spatially averaged trend in drift speed within the Arctic Basin is % ± %/decade, and ranges between −4% and 16%/decade depending on the by: Ex: Global climate change as summer sea ice melts in the Arctic.

A arctic temps. rise summer sea ice and glacial melting accelerate. This causes light-colored snow and sea surfaces, which reflect sunlight and so remain cooler, to be replaced by darker-colored open surfaces, which absorbs sunlight and become warmer.

14 1. Introduction 15 Observations of the sea ice extent in the Southern Ocean derived from satellite data display a trend of to million km2 per decade between November and December 16 17 (Vaughan et al.,). Although the magnitude of this trend is subject to uncertainties 18 (e.g.,Eisenman et al.,), the behavior of the Antarctic sea ice cover is in sharp contrast.

Abstract Arctic sea ice drift forecasts of 6 h–9 days for the summer of are generated using the Marginal Ice Zone Modeling and Assimilation System (MIZMAS); the model is driven by 6 h atmosphe Cited by: Gridded Monthly Arctic Sea Ice Back tofor Analysis or Browsing J Until now, climate diagnostic applications, reanalyses, and atmospheric modeling studies that needed a lower boundary condition did not have an arctic-wide gridded ice concentration data set to use based on observations and one that extends back as far as the.

The sea-ice melting related to either WDC or THC shutdown is relatively weak (Fig. 9e, f). It has been shown in Fig. 5b that the WDC advection change has salinification effect on the upper ocean between 40–60°N. Therefore, it is the sea-ice melting Cited by: Grumbine [, ] compares ice drift forecasts generated from wind forecasts and an empirical free drift sea ice model [Thorndike and Colony, ].

Grumbine [] reports correlations and RMS errors for distance (equivalent to speed in km/d) for different forecast by: Congelation ice – Ice that forms on the bottom of an established ice cover; Drift ice – Sea ice that is not attached to land and may move on the sea surface in response to wind and ocean currents; Fast ice – Sea ice that is connected to the coastline, to the sea floor along shoals or to grounded icebergs.

How Melting Arctic Ice Could Cook the Tropics The loss of sea ice from the Arctic Ocean will alter wind patterns and ocean currents, causing changes across the planet. Authored by by Gloria Dickie Wordcount J | words, about 2 minutes Share this article.

Share this: Share on. Also, the warming of the atmosphere has led to the melting of continental ice sheets and alpine glaciers, both of which increase the amount of water in ocean basins, causing sea level to rise.

The melting of Arctic ice does not cause sea level to rise, as this ice is already floating on the surface of ocean water (just as an ice cube melting in. The time series in Figure 4 shows sea ice drift and deformation along with the most important forcing (wind and air temperatures) distance to the sea ice edge and sea ice concentration.

The temperature and wind data shown on the figure are observations from the meteorological mast at 2 and 10 m [ Cohen et al., ] positioned approximately Cited by: This year () the initial state of the sea ice-ocean model has been constrained by sea-ice observations in a second out-of-competition forecast for the September sea-ice extent.

The data streams used comprise CryoSat-2 ice thickness generated by AWI, ice concentration, snow depth and sea-surface temperature. Global Warming Hoax The concepts of “global warming” and “climate change” were originally designed by the Roman Empire in Greenland in order to deceive the world into thinking that the Greenland ice sheet along with the polar ice caps are melting or at risk of melting.

Never mind the fact that the Artic, Antarctica, the North Pole and the South Pole do not even exist in reality. Skillful spring forecasts of September Arctic sea ice extent using passive microwave sea ice observations.

Earth's Future, ; DOI: /EF Cite This Page. Download pdf variations in Arctic sea ice is a series that attempts to determine the arctic warming events through the Holocene which commenced some years ago. Part 1 covered the warm period from approx.

to This paper – Part 2 – examines the period of warming with a decade long overlap. Ebook sea-ice extent data for the Northern Hemisphere ebook essentially no trend for Arctic sea-ice for the past 11 years. Based on fundamental climate observations and research it has been proposed by several scientists that the Arctic might have entered a new regime with its most conspicuous consequence a reduction or even inversion of recent Arctic sea ice trends.