Create accountLogin

Recent searches

No recent searches

Search options

Only available when logged in.
mathstodon.xyz is one of the many independent Mastodon servers you can use to participate in the fediverse.
A Mastodon instance for maths people. We have LaTeX rendering in the web interface!

Administered by:

Server stats:

2.8K
active users

mathstodon.xyz: AboutStatusProfiles directoryPrivacy policy

Mastodon: AboutGet the appKeyboard shortcutsView source codev4.3.7

#terrestrial

0 posts0 participants0 posts today
Public *
💧🌏 Greg Cocks

Cuadro Físico Meteoro y Geológico de la Tierra y Reloj Cosmográfico. (Physical, Meteorological, and Geological [1879] Chart of the Earth and Cosmographic Clock.)
--
davidrumsey.com/luna/servlet/d <-- shared David Rumsey Map Collection holding, and download the high resolution digital copy of the map…
--
[the level of detail - with the ballon and other cartographic affectations…]
#GIS #spatial #mapping #cartography #maps #oldmaps #global #world #geography #geology #flora #fauna #terrestrial #FridayFeeling #gischat #Spain #rivers #mountains #humanity #globe #earth
@DavidRumseyMapCenter

Public
Mikko Tuomi

The upcoming extremely large telescopes will provide the first opportunity to search for signs of #habitability and #life on non-transiting #terrestrial #exoplanets.

For the most accessible nearby target, #Proxima Centauri b, we may be able to rule out a sub-Neptune #atmosphere in as little as a single hour of observing, and some #biosignature disequilibrium pairs may be accessible in 10 hours.

#astronomy #astrobiology
arxiv.org/abs/2503.08592

arXiv logo
arXiv.orgThere's more to life in reflected light: Simulating the detectability of a range of molecules for high-contrast, high-resolution observations of non-transiting terrestrial exoplanetsThe upcoming extremely large telescopes will provide the first opportunity to search for signs of habitability and life on non-transiting terrestrial exoplanets using high-contrast, high-resolution instrumentation. However, the suite of atmospheric gases in terrestrial exoplanet environments that are accessible to ground-based reflected light observations has not been thoroughly explored. In this work, we use an upgraded Extremely Large Telescope (ELT) detectability pipeline to simulate the detectability of gases that can serve as habitability markers, potential biosignatures, and false positive discriminants in the atmospheres of Earth-sized and sub-Neptune planets. We calculate molecular detectability for five photochemically self-consistent atmosphere types, including the modern and Archean Earth, uninhabited biosignature ``false positive'' environments, and a sub-Neptune, over a grid of observational configurations for non-transiting targets within 10pc of Earth. For the most accessible nearby target, Proxima Centauri b, our results suggest that we may be able to rule out a sub-Neptune atmosphere in as little as a single hour of observing, and two biosignature disequilibrium pairs (O$_2$/CH$_4$ and CO$_2$/CH$_4$) may be accessible in $\sim 10$ hours for the most optimistic scenario. It may also be possible to discriminate uninhabited worlds, and rule out biosignature false positives by identifying contextual indicators (CO and H$_2$O) of abiotic O$_2$ and/or CH$_4$ buildup on similar timescales. In the near term, ELT reflected light observations will likely allow us to characterize multiple nearby terrestrial atmospheres, and ultimately search for signs of habitability and life.
Public *
💧🌏 Greg Cocks

Glacier Melt Intensifying Freshwater Loss And Accelerating Sea-Level Rise
--
esa.int/Applications/Observing <-- shared technical article
--
doi.org/10.1038/s41586-024-085 <-- shared paper
--
#GIS #spatial #mapping #GlacierMassBalanceIntercomparison #glacial #glacier #global #cryosphere #regional #freshwater #water #resources #waterresources #watersecurity #sealevel #sealevelrise #SLR #rate #change #spatialanalysis #spatiotemporal #ice #snow #loss #massloss #greenland #antarctic #icesheet #anthropogenic #climatechange #melt #melting #risk #hazard #geohazard #geology #engineeringgeology #marine #terrestrial #ecosystems #watercycle #masschange #insitu #remotesensing #local #observation #model #modeling #projection

map and charts - Global glacier mass changes from 2000 to 2023
charts - Annual and cumulative glacier mass change from 2000 to 2023
satellite image - Chugach Mountains, Alaska - Glaciers in the Chugach Mountains of Alaska. This image, captured by the Copernicus Sentinel-2 mission on 6 October 2017, shows the melting Scott (left), Sheridan (middle) and Childs (right) glaciers feeding lakes and rivers in their forefields.
photo - Golubin Glacier, Kyrgyzstan, 2012
Public *
Stefan F. Wirth

The #terrestrial #pulmonate #gastropods (#Stylommatophora, Gastropoda) have two pairs of #retractile #tentacles, an #apomorphy (#evolutionary innovation of the stem species) of the higher taxon Euthyneura. The rear pair of tentacles is elongated and has #eyes at its tips.
My photos show them in a close #macro shot using the Mediterranean #snail #species #Cornu #aspersum (#Helicidae).
#biodiversity #evolution
© #StefanFWirth Berlin 2024

Photos
C. aspersum, 2020, New edit 2024 © S. F. Wirth

Public *
💧🌏 Greg Cocks

New [2018] 30 Metre Resolution Global Shoreline Vector And Associated Global Islands Database For The Development Of Standardized Ecological Coastal Units
--
doi.org/10.1080/1755876X.2018. <-- shared 2018 paper
--
#GIS #spatial #mapping #coast #coastline #global #shoreline #landsat #remotesensing #spatialanalysis #extraction #AI #machinelearning #GSV #GSHSS #ecology #terrestrial #marine #ECU #waters #GEO #GoogleEarthEngine #MBON #BluePlanet #water #hydrography #hydrospatial #GroupOnEarthObservations
@GroupOnEarthObservations #islands @GEOSEC2025

maps - Top – The GSV along the Florida keys in the United States. The continental mainland of North America is shown in tan, islands > 1 km2 in area are shown in green, and islands < 1 km2 are shown in red. These landmasses are depicted at a 1:1,000,000 scale. Bottom – For cartographic reference, the same area of the Florida Keys
maps/landsat image - A visual comparison of the GSV and the GSHHS (Wessel and Smith Citation1996) for an archipelago at the westernmost end of the Florida Keys, United States. The underlying image is from a 1:65,000 level zoom of Esri's World Image Basemap. The yellow lines represent shorelines from the GSHHS, and the red lines depict GSV shorelines. Only the largest polygon shown is > 1 km2. The GSV shows improvement in the visual fit of the coastline vectors to the shore.
photo - shoreline, Florida Keys, USA
annonated map - Illustrative example of the ecological coastal units (ECUs) spatial analytical framework showing the new Global Shoreline Vector (GSV) along a stretch of coast in northeastern Puerto Rico. The GSV is shown with regularly spaced segments attributed and symbolised, in this case, by sinuosity. Perpendicular transects placed at segment intervals are also shown. The segments and transects represent potential spatial objects which could be attributed with data and used to delineate ECUs. The proposed ecological zonation is also shown, including offshore (a) and nearshore (b) coastal waters separated by the 30 m depth contour, and coastal land areas (c) between the GSV and the inland limit of the coastal plain.
Public
💧🌏 Greg Cocks

NASA Satellites Reveal Abrupt Drop In Global Freshwater Levels | An Abrupt Decline in Global Terrestrial Water Storage and Its Relationship with Sea Level Change
--
phys.org/news/2024-11-nasa-sat <-- shared technical article
--
doi.org/10.1007/s10712-024-098 <-- shared paper
--
unesco.org/reports/wwdr/en/202 <-- shared UN report on water stress
--
#GIS #spatial #mapping #remotesensing #satellite #NASA #GRACE #ERA5 #water #waterresources #climatechange #sealevel #sealevelrise #SLR #waterresources #global #freshwater #watermanagement #arid #terrestrial #mascons #TWS #terrestialwaterstorage #surfacewater #groundwater #aquifers #spatialanalysis #model #modeling #spatiotemporal #drought #wateruse #watersecurity #agriculture #irrigation #hydrology #publichealth #risk #hazard #naturalresources #waterquality #gravity

a Time series of near-global (60° S–70° N) mean SST anomalies, Niño 3.4 (black), the Pacific Decadal Oscillation (PDO) index with 1-year smoothing (blue), and a North Atlantic tripole index (brown). Negative PDO corresponds to anomalous positive SSTs in the central N. Pacific. b Near-global ERA5 SST trend, 1980–2022, °C/yr. c Correlation between the Niño 3.4 index and GRACE/FO d(TWS)/dt, the latter lagged 2 months with 4-month smoothing applied. d Correlation between the PDO index and GRACE/FO TWS, 3-month smoothing applied
Map of mascons in which the GRACE/FO era minimum terrestrial water storage occurred after the start of 2015, color coded for the year of that minimum. The time series plotted in Fig. 2 is averaged over the South American region delineated in red
Comparison of ERA5-Land, GRACE/FO, and complementary observations: a deseasonalized time series of global land average (60S-70N) TWS anomalies (mm) from GRACE/FO, ERA5-Land, and ERA5 vertically integrated moisture flux convergence, b ERA5-Land precipitation (P), evapotranspiration (ET), and runoff (RO), c same as b but for GPCP P, GLEAM ET and G-RUN RO. Units in b and c are mm d−1, d 2003–2022 trend in ERA5-Land P-ET, e Same as d but for GPCP v3.2 P—GLEAM 3.6a ET. Units in d and e are mm d−1/yr. All anomalies are relative to the 2003–2022 monthly resolved climatological mean
TWS trends (mm/yr) over the period 2003–2022 in a GRACE/FO and b ERA5-Land; and c correlations of monthly TWS anomalies between GRACE/FO and ERA5-Land. Ice sheets and areas of significant glacial extent have been masked
Public
Teresita Porter 🙋🏻‍♀️

Marine ecozones represent a major gap in Canadian DNA barcoding efforts

Comparison of the DNA barcode coverage from Canadian terrestrial and marine ecozones.

facetsjournal.com/doi/full/10.

FACETSMarine ecozones represent a major gap in Canadian DNA barcoding effortsBecause of Canada’s large size, it is impractical to obtain a comprehensive perspective on biotic change through morphological approaches. DNA metabarcoding offers a potential path, but its application requires access to a well-parameterized DNA barcode reference library. This study presents the current state of DNA barcode coverage for Canadian animals, highlighting progress, identifying gaps, and providing recommendations for future research. Our analysis indicates that many of the known species (100 000 terrestrial and 6000 marine) in the Canadian fauna possess DNA barcode coverage, but there are important gaps geographically and taxonomically. We summarize DNA barcode coverage for the species in freshwater, marine, and terrestrial environments by ecoregion, finding that 95.6% of the 2.3 million Canadian barcode records derive from terrestrial ecosystems. Although the density of barcode records per 100 km² is 13x higher for terrestrial than aquatic environments (22.4 vs. 1.7), coverage for 58% of marine species is available (54% for annelids, 52% for arthropods, 88% for chordates, 39% for echinoderms, and 46% for molluscs). By revealing data-deficient areas and taxonomic groups, this study offers a roadmap for expanding the DNA barcode library for the Canadian fauna as an essential foundation for the scalable biosurveillance initiatives that inform biodiversity conservation efforts.
#DNAbarcoding#Canada#terrestrial
Public *
O=C=O

2024 LIVING PLANET REPORT

Over the past 50 years (1970–2020), the average size of monitored #wildlife populations has shrunk by 73%.
Based on almost 35,000 population trends and 5,495 species of #amphibians, #birds, #fish, #mammals and #reptiles. Freshwater populations have suffered the heaviest declines, falling by 85%, followed by #terrestrial (69%) and #marine populations (56%).

Report (PDF):
wwf.at/wp-content/uploads/2024

#BiodiversityCrisis
#Biodiversity
#Anthropocene
#Extinction

Cover 2024 LIVING PLANET REPORT At a regional level, the fastest declines have been seen in Latin America and the Caribbean – a concerning 95% decline – followed by Africa (76%) and the Asia and the Pacific (60%). Declines have been less dramatic in Europe and Central Asia (35%) and North America (39%), but this reflects the fact that large-scale impacts on nature were already apparent before 1970 in these regions: some populations have stabilized or increased thanks to conservation efforts and species reintroductions. Habitat degradation and loss, driven primarily by our food system, is the most reported threat in each region, followed by overexploitation, invasive species and disease. Other threats include climate change (most cited in Latin America and the Caribbean) and pollution (particularly in North America and Asia and the Pacific).
Graphic: Understanding drivers of change to nature through regional perspectives The global LPI does not give us the entire picture – trends vary between regions due to different types and levels of pressure placed on nature over the last 50 years. The Intergovernmental Science- Policy Platform on Biodiversity and Ecosystem Services (IPBES) divides the world into different geographic regions24 to help assess and monitor nature. The LPI trends presented here follow this classification, with all terrestrial and freshwater populations within a country assigned to an IPBES region. The Americas were further subdivided into North America, and Latin America and the Caribbean (Mesoamerica, the Caribbean and South America combined), as these areas have experienced environmental change over different time periods. Trends for each species group are weighted according to how many species are found in each IPBES region (Figure 1.5)
Figure 1.5 The Living Planet Index by IPBES regions for combined terrestrial and freshwater populations from 1970 to 2020, based on 2,449 populations and 935 vertebrate species in North America, 3,936 populations and 1,362 species in Latin America and the Caribbean, 4,615 populations and 619 species in Europe and Central Asia, 4,622 populations and 768 species in Asia and the Pacific and 2,304 monitored populations of 552 species in Africa. White lines represent the index value and the shaded areas represent the statistical uncertainty surrounding the value.
Public
💧🌏 Greg Cocks

There's A Hidden Water Cycle In The Amazon We Barely Know Anything About
--
sciencealert.com/theres-a-hidd <-- shared technical article
--
pnas.org/doi/10.1073/pnas.2306 <-- shared paper / review
--
#GIS #spatial #mapping #water #hydrology #Amazon #AmazonRainForest #rainforest #brazil #peru #colombia #model #modeling #watercycle #river #stream #streamflow #freshwater #watersecurity #environment #habitat #biodiversity #forest #wetlands #hydroclimate #AAA #pathway #rainfall # #precipitation #evapotranspiration #biome #multifactor #spatialanalysis #spatiotemporal #terrestrial #aquatic #sediment #nutrients #climatechange #basin #amazonbasin #temperature #climatology #waterbalance #socialecology

schematic / model graphic - Key processes along the AAA hydroclimate pathway, reflecting how the regional water cycle is linked through continental hydrology, moving water from the Andes to Amazon to Atlantic, and through large-scale atmospheric circulation, moving moisture from the Atlantic to Amazon to Andes. These processes along the AAA pathway underpin social–ecological systems within and beyond the Amazon basin boundaries.
maps - temperature trends across the Amazon basin
photo - parrots on a branch in the rain, Amazon Rain Forest
maps and charts - Change in monthly climatology of the surface and atmospheric water balance components of the Amazon Basin (A) and simplified scheme of these variables over tropical South America (B)
Public
Mikko Tuomi

The discovery and characterization of Earth-sized #planets that are in, or near, a tidally locked state are of crucial importance to understanding #terrestrial #planet evolution.

Present terrestrial #exoplanet demographics are heavily biased toward short-period planets, many of which are expected to be tidally locked, and also potentially runaway #greenhouse candidates.

#exoplanets #astronomy #astrobiology
nature.com/articles/s41550-022

NatureAtmospheric dynamics of a near tidally locked Earth-sized planet - Nature AstronomyVenus is used as the paradigm of Earth-sized near tidally locked planets. The behaviour and dynamics of its atmosphere are used to gain insight into the climate of terrestrial exoplanets with similar orbital configurations.
Continued thread
Public
Spaceflight 🚀

#NCBI 📆 2020 #Solar Minimum will lead to terrestrial cooling ❄️. In the next 500 years there are two modern grand solar minima approaching in the #Sun ☀️, the modern one in the 21st century (📆 2020–2053). The reduction 📉 of #terrestrial temperature during the next 30 years can have important implications for different parts of the planet on growing vegetation, agriculture 🌾, food supplies 🍽️, and heating 🌡️ needs ncbi.nlm.nih.gov/pmc/articles/

PubMed Central (PMC)Modern Grand Solar Minimum will lead to terrestrial cooling
#SpaceWeather#ClimateChange#NationalLibraryOfMedicine
SearchLive feeds
About