2018-06-08 01:40:57 UTC
Background levels of methane in Mars' atmosphere show strong seasonal
Christopher R. Webster, Paul R. Mahaffy, Sushil K. Atreya,
John E. Moores, Gregory J. Flesch, Charles Malespin,
Christopher P. McKay, German Martinez, Christina L. Smith,
Javier Martin-Torres, Javier Gomez-Elvira, Maria-Paz Zorzano,
Michael H. Wong, Melissa G. Trainer, Andrew Steele,
Doug Archer Jr., Brad Sutter, Patrice J. Coll,
Caroline Freissinet, Pierre-Yves Meslin, Raina V. Gough,
Christopher H. House, Alexander Pavlov, Jennifer L. Eigenbrode,
Daniel P. Glavin, John C. Pearson, Didier Keymeulen,
Lance E. Christensen, Susanne P. Schwenzer, Rafael Navarro-Gonzalez,
Jorge Pla-García, Scot C. R. Rafkin, Álvaro Vicente-Retortillo,
Henrik Kahanpää, Daniel Viudez-Moreiras, Michael D. Smith,
Ari-Matti Harri, Maria Genzer, Donald M. Hassler,
Mark Lemmon, Joy Crisp, Stanley P. Sander,
Richard W. Zurek, Ashwin R. Vasavada
Science 08 Jun 2018:
Vol. 360, Issue 6393, pp. 1093-1096
Variable levels of methane in the martian atmosphere have eluded
explanation partly because the measurements are not repeatable in time
or location. We report in situ measurements at Gale crater made over a
5-year period by the Tunable Laser Spectrometer on the Curiosity
rover. The background levels of methane have a mean value 0.41 ± 0.16
parts per bn by volume (ppbv) (95% confidence interval) and
exhibit a strong, repeatable seasonal variation (0.24 to 0.65
ppbv). This variation is greater than that predicted from either
ultraviolet degradation of impact-delivered organics on the surface or
from the annual surface pressure cycle. The large seasonal variation
in the background and occurrences of higher temporary spikes (~7 ppbv)
are consistent with small localized sources of methane released from
martian surface or subsurface reservoirs.
Methane is produced in Earth's atmosphere predominantly through
biological processes (1, 2). Its existence in an oxidizing atmosphere
such as Mars' is recognized as a potential biosignature whose putative
sources could include methanogenic bacteria (1, 3, 4). Alternative
nonbiological methane production mechanisms include geological
processes such as serpentinization of olivine or pyroxene (5),
ultraviolet (UV) degradation of indigenous or meteoritically delivered
organics (6, 7), formation by the impact of comets (8), release from
subsurface clathrates (9) or gas absorbed in the regolith (10, 11),
erosion of basalt with methane inclusions (12), or geothermal
processes (13). As a strong greenhouse gas, methane bursts on early
Mars may have been responsible for intermittent lake-forming
climates-a process which could be ongoing today (14).
New rating system clarifies real-world NOx emissions
Cesca Turton, The Telegraph
Coal miner's death after silicosis diagnosis a warning on dangerous
* Brisbane tunnel workers face lung disease from silica exposure: expert
* Black lung health scheme needs 'major overhaul', review finds
* 'Black lung' makes comeback in Queensland coal mines
ABC 7.30, 07 Jun 2018 6:53pm
Queensland miner Tyrone Buckton never spent a day underground but last week
died after being diagnosed with silicosis.
The lung disease is caused by high levels of exposure to silica dust, which
the union says could pose a greater workplace hazard than coal dust.
Mr Buckton worked at the Goonyella Riverside open cut coal mine, which is
owned by BHP Billiton and Mitsubishi, for more than 30 years.
He was diagnosed with silicosis last Oct.
Al Jazeera Weather @AJEWeather 07 Jun 2018 07:14Z
Flood warnings issued across Western Australia's Pilbara district after
three times the monthly average falls in 2 days.
Qld truckie recovers from puncture wounds after fighting off 'beast' of a
ABC Sunshine Coast, 07 Jun 2018 08:03Z
* Cats are killing more than 1 mn birds in Australia every day
* Central Queensland council sticks by bounty on 'monster' feral cats
* Fighting feral cats with lasers and poison spray
A Queensland man's encounter with an "enormous" feral cat he says was the
size of a cattle dog resembles a modern-day Crocodile Dundee script.
Adam Whitehouse has lived in the bush for more than a decade, but has never
seen anything like the recent incident on the veranda of his Kybong home,
south of Gympie in Queensland.
Christian Porter defends media after Chinese diplomat's accusations
ABC News, 07 Jun 2018 09:22Z
Attorney-General Christian Porter launches a strident defence of the press
after another senior Chinese diplomat accuses the Australian media of
fabricating stories about Beijing's influence in Australia.
Al Jazeera Weather @AJEWeather 07 Jun 2018 12:13Z
Tropical Storm Aletta strengthens off the west coast of Mexico
Al Jazeera Weather @AJEWeather 07 Jun 2018 12:14Z
Tropical Storm Ewiniar kills 4 people in south China's Guangdong Province
Shark Bay dolphins use 'unusual' method of keeping track of friend or foe
ABC News, 07 Jun 2018 16:23Z
Male dolphins in the Shark Bay world heritage site use individual names for
each other rather than a group name, but can still recognise friend from foe,
and researchers now think they know how it works.
US screens more staff in China over mystery health issues
ABC News, 07 Jun 2018 17:04Z
A US medical team is screening more Americans who work at a consulate in
southern China, with the State Dept confirming it has evacuated a
number of employees who have experienced unexplained health issues like
those that affected US personnel in Cuba and China.
China furious, as Government and Labor unite on barriers against
ABC News, 08 Jun 2018
New laws to counter foreign interference that have infuriated Chinese
authorities receive bipartisan support, with Bill Shorten sticking like glue
to the Government on national security issues for reasons of politics as
well as substance, writes Michelle Grattan.
Due to higher costs, coal and even gas are being utilized less and less in
favor of lower priced and less polluting renewables.
Image source: Think Progress and Bloomberg New Energy Finance.
Perth weather: Cold snap as winter hits southern half of WA with a vengeance
ABC News, 08 Jun 2018 11:28am
Winter has hit Perth with a shock after temperatures dipped to 4.7 degrees
Celsius, making this morning the coldest day of the year so far.
The DoE May Bail Out Failing Coal Plants in the Name of National ...
Futurism, 04 Jun 2018
The Trump administration's latest plan to "save" coal? Force companies to
pay for it. In the United States, coal and nuclear power are on their ...
Is coal economically viable?
Global Risk Insights, 5 Jun 2018
Opinion: Trump's latest attempt to protect coal looks positively socialist --
Washington Post, 06 Jun 2018 23:32Z
International: Trump officials took actions on energy policies suggested by
coal ... -- Chicago Tribune, 07 Jun 2018 02:32Z
In-Depth: Trump Plan to Prop Up Coal, Nuclear Won't Protect the Electric
Grid -- US News & World Report, 4 Jun 2018
Opinion: Bailing Out the Coal Industry Will Hurt Consumers -- New York Times,
4 Jun 2018
OPEC finds global proven crude oil reserves fell 0.4% to 1.483 tr ...
Platts, 07 Jun 2018 12:35Z
Global proven crude oil reserves declined 0.4% in 2017 from the 2016 level
to 1.483 tr barrels, while gas reserves rose 0.2% to 199.4 ...
China's secretive oil reserves are OPEC's latest concern in managing ...
Hellenic Shipping News Worldwide, 07 Jun 2018 10:35Z
OPEC: Azerbaijan has 7bln barrels of confirmed oil resources
APA, 07 Jun 2018 16:35Z
Oil falls on US crude build; global supply
Nine, 06 Jun 2018 22:35Z
Oil prices drop on surprise US stockpile build
The Globe and Mail, 06 Jun 2018
China Deals Shocking Blow To Solar Industry
OilPrice.com, 07 Jun 2018 16:29Z
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