Featured Research

from universities, journals, and other organizations

More accurate estimate of amount of water on surface layer of Mars

Date:
October 1, 2013
Source:
Finnish Meteorological Institute
Summary:
NASA's rover Curiosity, which landed on the surface of Mars on 6 August 2012, has led to more detailed estimates of the amount of water on the Martian surface.

NASA's Mars rover Curiosity.
Credit: NASA/JPL-Caltech

NASA's rover Curiosity, which landed on the surface of Mars on 6 August 2012, has led to more detailed estimates of the amount of water on the Martian surface. The Finnish Meteorological Institute is part of the NASA research team.

A study published in the magazine Science on 27 September reveals that according to observations made by the NASA rover Curiosity, the surface layer of the Gale crater near the Martian equator has a water content of about two percent, which is at the lower end of previous estimates. The Finnish Meteorological Institute is also part of the NASA research team. Previous estimates of the amount of water based on orbital observations have varied between 2 and 12 percent. This estimate is based mainly on measurements by the Mars Odyssey probe. It is estimated that the surface layer at higher latitudes contains considerably more water. This is based both on orbital observations and measurements by the Phoenix lander in 2008.

The main observational device in the study of the surface layer of Mars was Curiosity's ChemCam laser spectrometer, which examines the elemental content of targets by shooting laser pulses at them, and by spectroscopically examining the resulting flashes. ChemCam is capable of studying its environment at a distance of up to about seven metres with the help of laser pulses. Observations of the relative humidity of the Martian atmosphere, which were needed for the study, were conducted using the REMS-H device supplied by the Finnish Meteorological Institute.

The research group also studied the fluctuation of water vapour between the Martian atmosphere and the surface layer. In this process, the relative humidity of the atmosphere plays an important role.

"During this study there were no observations of a water cycle between the atmosphere and the surface layer that would have been linked with the diurnal cycle," says Ari-Matti Harri, head of research at the Finish Meteorological Institute. During the time of operation of ChemCam, the relative humidity of the atmosphere was low -- about 20 percent. "In a longer time-frame, it is likely that water circulation between the surface layer and the atmosphere does occur at higher levels of relative humidity," Ari-Matti Harri adds.

Meteorological Institute's devices on Mars bring new series of observations

The Finnish Meteorological Institute has supplied the Curiosity rover with the instruments (REMS-P and REMS-H) for measuring pressure and humidity in the Martian atmosphere. The instruments are part of the REMS package of instruments for studying the Martian environment supplied for the rover by the Spanish INTA-CAB institute.

The REMS-H and REMS-P measuring devices have monitored pressure and humidity in the Martian atmosphere for about 400 days so far, which is slightly more than half of a year on Mars. The aim is to compile a time series of pressure and humidity covering an entire Martian year. This would bring another series of measurements after those of the Viking landers (1976 -- 82) that would cover an entire year on Mars. With the help of these observations, the behaviour of the Martian atmosphere is being studied on a scale ranging from seconds to the alternation of seasons on Mars. This also allows for a study of changes in the climate of Mars in the past 40 years, by comparing series of observations by the Viking landers and those of Curiosity together with orbital observations.

At present Curiosity is moving toward Mt. Sharp, a mountain located in the middle of the Gale Crater. By studying its surface layers, Curiosity will seek to ascertain the environmental conditions on Mars going back hundreds of millions of years.

Atmosphere on Mars resembles that of Earth

Composed of carbon dioxide, the atmosphere on Mars is dry, cold, and about 100 times thinner than that on Earth. The tilt of the axes of both Mars and Earth and the similar lengths of the day on both planets mean that the atmospheres behave in a similar fashion. The similar characteristics of the atmospheres of Mars and Earth give a reason for comparative planetary research. "By investigating Mars we can also learn something new about Earth and its atmosphere, for which reason this is a very important target of research for the Meteorological Institute," Ari-Matti Harri says. The similarities of the atmospheres has made it possible for the Finnish Meteorological Institute, together with the University of Helsinki to use the HIRLAM weather forecasting model used in the Nordic Countries and other places, to work in research about Mars.


Story Source:

The above story is based on materials provided by Finnish Meteorological Institute. Note: Materials may be edited for content and length.


Journal Reference:

  1. P.- Y. Meslin et al. Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars. Science, 2013; 341 (6153): 1238670 DOI: 10.1126/science.1238670

Cite This Page:

Finnish Meteorological Institute. "More accurate estimate of amount of water on surface layer of Mars." ScienceDaily. ScienceDaily, 1 October 2013. <www.sciencedaily.com/releases/2013/10/131001091203.htm>.
Finnish Meteorological Institute. (2013, October 1). More accurate estimate of amount of water on surface layer of Mars. ScienceDaily. Retrieved September 15, 2014 from www.sciencedaily.com/releases/2013/10/131001091203.htm
Finnish Meteorological Institute. "More accurate estimate of amount of water on surface layer of Mars." ScienceDaily. www.sciencedaily.com/releases/2013/10/131001091203.htm (accessed September 15, 2014).

Share This



More Space & Time News

Monday, September 15, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

SpaceX's Elon Musk Really Wants To Colonize Mars

SpaceX's Elon Musk Really Wants To Colonize Mars

Newsy (Sep. 14, 2014) Elon Musk has been talking about his goal of colonizing Mars for years now, but how much of it does he actually have figured out, and is it possible? Video provided by Newsy
Powered by NewsLook.com
International Space Station Crew Returns Safely To Earth

International Space Station Crew Returns Safely To Earth

Newsy (Sep. 11, 2014) The three-man crew touched down in Kazakhstan Wednesday after more than five months of science experiments in orbit. Video provided by Newsy
Powered by NewsLook.com
Solar Storm To Hit This Weekend, Scientists Not Worried

Solar Storm To Hit This Weekend, Scientists Not Worried

Newsy (Sep. 11, 2014) Two solar flares which erupted in our direction this week will arrive this weekend. The resulting solar storm will be powerful but not dangerous. Video provided by Newsy
Powered by NewsLook.com
Solar Flare Surges Off Sun

Solar Flare Surges Off Sun

Reuters - US Online Video (Sep. 11, 2014) NASA captures video of a significant flare surging off the sun. Jillian Kitchener reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

    Technology News



    Save/Print:
    Share:

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile: iPhone Android Web
    Follow: Facebook Twitter Google+
    Subscribe: RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins