Home / Weather / File Chilly Higher Mesospheric Temperatures Recommend Any other Just right Noctilucent Cloud Viewing Season « Roy Spencer, PhD

File Chilly Higher Mesospheric Temperatures Recommend Any other Just right Noctilucent Cloud Viewing Season « Roy Spencer, PhD

File Chilly Higher Mesospheric Temperatures Recommend Any other Just right Noctilucent Cloud Viewing Season

Would possibly 31st, 2020 through Roy W. Spencer, Ph. D.

Noctilucent clouds (NLCs) are frequently visual within the excessive higher environment (80-85 km altitude) smartly after sundown within the past due spring and summer time at prime northern latitudes. They shape from ice condensing on meteoric mud at extraordinarily chilly temperatures (beneath 150 Kelvin or -190 deg. F). The chilly temperatures are because of adiabatic cooling from dynamic uplift mixed with little ozone to take in the solar’s ultraviolet radiation.

Noctilucent clouds on Would possibly 31, 2020 (Alan Tricky, Scotland)

With present sun minimal stipulations lowering sun heating through ultraviolet radiation, and slowly expanding CO2 within the environment inflicting enhanced infrared cooling to outer house, file low temperature are happening. This has prolonged the southernmost viewing alternative for NLCs from the standard ~60 deg. N latitude to as little as 35N latitude closing 12 months, with NLC sightings close to Los Angeles and Las Vegas in 2019.

This fresh article through Dr. Tony Phillips steered that 2020 is shaping as much as be every other excellent NLC viewing season. An previous article through Tony incorporated this great plot of April-Would possibly temperatures at 80 N latitude from this 12 months in comparison to earlier years, appearing the overall cooling development all through the present sun minimal stipulations.

Knowledge plot courtesy of Dr. Lynn Harvey, U. of Colorado.

We downloaded some extra fresh Air of mystery satellite tv for pc Microwave Limb Sounder knowledge, and plotted it as a serve as of latitude. Be aware how briskly temperatures dropped in handiest 6 days… 1-2 deg. C in step with day relying upon latitude.

Higher mesospheric temperatures at 83 km altitude on two other days in Would possibly, 2020 as a serve as of latitude. Traces are 2d order polynomial suits to the knowledge, offering moderate temperatures as a serve as of latitude.

The 141 Ok moderate temperature on Would possibly 27 (Day 148) at 80N latitude seems to be a brand new file low if we evaluate it to the knowledge within the earlier plot through Dr. Harvey.

I can attempt to stay observe of those temperatures because the NLC season progresses within the coming weeks. To this point, NLC sightings were most commonly in northern Europe and the United Kingdom.

File Chilly Higher Mesospheric Temperatures Recommend Any other Just right Noctilucent Cloud Viewing Season

Would possibly 31st, 2020 through Roy W. Spencer, Ph. D.

Noctilucent clouds (NLCs) are frequently visual within the excessive higher environment (80-85 km altitude) smartly after sundown within the past due spring and summer time at prime northern latitudes. They shape from ice condensing on meteoric mud at extraordinarily chilly temperatures (beneath 150 Kelvin or -190 deg. F). The chilly temperatures are because of adiabatic cooling from dynamic uplift mixed with little ozone to take in the solar’s ultraviolet radiation.

Noctilucent clouds on Would possibly 31, 2020 (Alan Tricky, Scotland)

With present sun minimal stipulations lowering sun heating through ultraviolet radiation, and slowly expanding CO2 within the environment inflicting enhanced infrared cooling to outer house, file low temperature are happening. This has prolonged the southernmost viewing alternative for NLCs from the standard ~60 deg. N latitude to as little as 35N latitude closing 12 months, with NLC sightings close to Los Angeles and Las Vegas in 2019.

This fresh article through Dr. Tony Phillips steered that 2020 is shaping as much as be every other excellent NLC viewing season. An previous article through Tony incorporated this great plot of April-Would possibly temperatures at 80 N latitude from this 12 months in comparison to earlier years, appearing the overall cooling development all through the present sun minimal stipulations.

Knowledge plot courtesy of Dr. Lynn Harvey, U. of Colorado.

We downloaded some extra fresh Air of mystery satellite tv for pc Microwave Limb Sounder knowledge, and plotted it as a serve as of latitude. Be aware how briskly temperatures dropped in handiest 6 days… 1-2 deg. C in step with day relying upon latitude.

Higher mesospheric temperatures at 83 km altitude on two other days in Would possibly, 2020 as a serve as of latitude. Traces are 2d order polynomial suits to the knowledge, offering moderate temperatures as a serve as of latitude.

The 141 Ok moderate temperature on Would possibly 27 (Day 148) at 80N latitude seems to be a brand new file low if we evaluate it to the knowledge within the earlier plot through Dr. Harvey.

I can attempt to stay observe of those temperatures because the NLC season progresses within the coming weeks. To this point, NLC sightings were most commonly in northern Europe and the United Kingdom.

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