scholarly journals Effects of Mount Pinatubo volcanic eruption on the hydrological cycle as an analog of geoengineering

2007 ◽  
Vol 34 (15) ◽  
Author(s):  
Kevin E. Trenberth ◽  
Aiguo Dai
Keyword(s):  
Volcanic Eruption ◽  
Hydrological Cycle ◽  
Mount Pinatubo

Volcanic impact on the tropical hydrological cycle 

2021 ◽  
Author(s):  
Roberta D'Agostino ◽  
Claudia Timmreck
Keyword(s):  
Volcanic Eruption ◽  
Hydrological Cycle ◽  
Wide Spectrum ◽  
Volcanic Eruptions ◽  
Internal Variability ◽  
Net Energy ◽  
Max Planck ◽  
Monsoon Area ◽  
Volcanic Forcing ◽  
The Impact

<p>The impact of volcanic forcing on tropical precipitation is investigated in a new set of sensitivity experiments within Max Planck Institute Grand Ensemble framework. Five ensembles are created, each containing 100 realizations for an idealized tropical volcanic eruption located at the equator, analogous the Mt. Pinatubo eruption, with emissions covering a range of 2.5 - 40 Tg S. The ensembles provide an excellent database to disentangle the influence of volcanic forcing on regional monsoons and tropical hydroclimate over the wide spectrum of the climate internal variability. Monsoons are generally weaker during the two years after volcanic eruptions and their weakening is a function of emissions: the strongest the volcanic eruption, the weakest are the land monsoons. The extent of rain belt is also affected: the monsoon area is overall narrower than the unperturbed control simulation. While the position of main ascents does not change, the idealised tropical volcanic eruption supports the shrinking of Hadley Cell's ascent and the narrowing of the ITCZ. We investigate this behavior by analysing the changes in Hadley/Walker circulation, net energy input and energy budget to find analogies/differences with global warming.</p>

scholarly journals Investigation of weather anomalies in the low-latitude islands of the Indian Ocean in 1991

2015 ◽  
Vol 33 (7) ◽  
pp. 789-804 ◽  
Author(s):  
A. Réchou ◽  
S. Kirkwood
Keyword(s):  
Indian Ocean ◽  
El Niño ◽  
Volcanic Eruption ◽  
El Nino ◽  
Sunshine Duration ◽  
Global Precipitation Climatology Project ◽  
The Philippines ◽  
Quasi Biennial Oscillation ◽  
Mount Pinatubo ◽  
The Indian Ocean

Abstract. Temperature, precipitation and sunshine duration measurements at meteorological stations across the southern Indian Ocean have been analysed to try to differentiate the possible influence of the Mount Pinatubo volcanic eruption in the Philippines in June 1991 and the normal weather forcings. During December 1991, precipitation on the tropical islands Glorieuses (11.6° S) and Mayotte (12.8° S) was 4 and 3 times greater, respectively, than the climatological mean (precipitation is greater by more than than twice the standard deviation (SD)). Mean sunshine duration (expressed in sun hours per day) was only 6 h on Mayotte, although the sunshine duration is usually more than 7.5 ± 0.75 h, and on the Glorieuses it was only 5 h, although it is usually 8.5 ± 1 h. Mean and SD of sunshine duration are based on December (1964–2001 for Mayotte, 1966–1999 for the Glorieuses). The Madden–Julian Oscillation (MJO) is shown to correlate best with precipitation in this area. Variability controlling the warm zone on these two islands can be increased by the Indian Ocean Dipole (IOD), El Niño, the quasi-biennial oscillation (QBO) and/or solar activity (sunspot number, SSN). However, temperature records of these two islands show weak dependence on such forcings (temperatures are close to the climatological mean for December). This suggests that such weather forcings have an indirect effect on the precipitation. December 1991 was associated with unusually low values of the MJO index, which favours high rainfall, as well as with El Niño, eastern QBO and high SSN, which favour high variability. It is therefore not clear whether the Mount Pinatubo volcanic eruption had an effect. Since the precipitation anomalies at the Glorieuses and Mayotte are more or less local (Global Precipitation Climatology Project (GPCP) data) and the effect of the Pinatubo volcanic cloud should be more widespread, it seems unlikely that Pinatubo was the cause. Islands at higher southern latitudes (south of Tromelin at 15.5° S) were not affected by the Pinatubo eruption in terms of sunshine duration, precipitation or temperature.

scholarly journals Radiative forcing from the 1991 Mount Pinatubo volcanic eruption

1998 ◽  
Vol 103 (D12) ◽  
pp. 13837-13857 ◽  
Author(s):  
Georgiy L. Stenchikov ◽  
Ingo Kirchner ◽  
Alan Robock ◽  
Hans-F. Graf ◽  
Juan Carlos Antuña ◽  
...  
Keyword(s):  
Volcanic Eruption ◽  
Radiative Forcing ◽  
Mount Pinatubo
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