Update on May 27, 2025: This springtime Landsat image shows snow-covered tundra streaked with wind-blown sediment near Utqiaġvik, Alaska, the northernmost city in the United States. Congratulations to ...

Update on May 27, 2025: This springtime Landsat image shows snow-covered tundra streaked with wind-blown sediment near Utqiaġvik, Alaska, the northernmost city in the United States. Congratulations to ...

Update on May 27, 2025: This springtime Landsat image shows snow-covered tundra streaked with wind-blown sediment near Utqiaġvik, Alaska, the northernmost city in the United States. Congratulations to ...

Your challenge is to use the comments section to tell us where it is, what we are looking at, and why it is interesting.

When the Minute 319 “pulse flow” began in March 2014, it was not clear whether the effort would be enough to reconnect the Colorado River with the Sea of Cortez. Some hydrologists thought there might ...

In response to Map of the Ancient Mississippi a few of you left comments to the effect of “no one should live in floodplains.” It’s an appealing notion, but I think it’s unrealistic. Anne Jefferson of ...

Sticking to the flood theme, here’s a recent map from the U.S. Army Corps of Engineers showing the predicted travel time for water in the Morganza Floodway. It’s a reasonably good map, with one big ...

We are now well on our way back home again, with our GPS stations dutifully recording ice motion in our absence. Several of the stations will be visited again this summer, and all will have a visit ...

Researcher Amy McNally spent two weeks in Yanco, Australia to participate in the three week Soil Moisture Active Passive Experiment-4 (SMAPEx-4) field campaign in May. The field campaign measures soil ...

It is no secret that many diesel cars and trucks emit more pollution under real-world driving conditions than during laboratory certification testing. Many lab tests, for instance, are run with ...

In the winter of 2013, thick haze enveloped northern China for several weeks. On January 12, 2013, the peak of that bad-air episode, the air quality index (AQI) rose to a staggering 775—off the U.S.