MT. HOOD ERUPTIONS.   Term Paper ID:28198 Click to get this paper

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Paper Abstract: Technical discussion of geological history of the volcano. Atmospheric affects. Paper Introduction: Analysis: Effect of Mt. Hood Eruption on Atmosphere Introduction Each of three major eruptive periods at Mount Hood (12,000- 15,000), 1,500-1,800, and 200-300 years ago) produced dacite domes, pyroclastic flows, and mudflows, but virtually no pumice. Most of the fine lithic ash that mantles the slopes of the volcano and the adjacent mountains fell from ash clouds that accompanied the pyroclastic flows. Widely scattered pumice lapilli that are present at the ground surface on the south, east, and north sides of Mount Hood may have been erupted during the mid-1800's, when the last known activity of the volcano occurred (REPORT: Recent Eruptive History..., 1998). The geologically recent history of Mount Hood suggests that the most likely eruptive event in the future will be the formati Text of the Paper: The entire text of the paper is shown below. However, the text is somewhat scrambled. We want to give you as much information as we possibly can about our papers and essays, but we cannot give them away for free. In the text below you will find that while disordered, many of the phrases are essentially intact. From this text you will be able to get a solid sense of the writing style, the concepts addressed, and the sources used in the research paper. fine lithic ash that mantles the slopes of the south east and north sides of Mount will be the formation ofanother dome probably accompany pyroclastic flows may depositas much as a meter propel rock fragmentsoutward from the sides of a dome at there seems to be little danger that deposits The bulk of the covered by Mount Hoodrocks The summit to occur up to km fromthe volcano river systems that drain the sides of Mt Hood thus indicating a vent ator now filled by the Crater River or km to its mouth at the The deposits of this periodinclude a its south side The Lewis andClark expedition of saw the occurred in the andwas centered at the short answer to the question of whether an has its own character Historical of eruption chronologies to prove that volcaniceruptions are the major phenomenon thought worth recording in the past is not The use of eruption chronologies to an eruption and anenvironmental phenomenon thought worth recording in the stratosphere which determined the climatic effectiveness of an eruptionand advanced These are Magnitude Determined from the volume of the eruption Analogous to intensity but are oxidised into an aerosol form primarily from be detected for up to three years following volatile material isenhanced beyond that opticaldepths by appeared to be climatically significant until several monthsafter an eruption Following the failed to increase Optical Depthsufficiently to cause major a direct link between the sulphur the lower atmosphere should be cooledand the stratosphere Rampino Self is reported Similar is not a significant temperature departure from thenormal and ash it isimpossible to guess if accurateaccount of an actual eruption Journal of Climate Bradley R Tellus Deepak A Newell R E Eds Mt public p clouds html Hansen J E Lacis A A estimate of explosive magnitude for al volcanism Journal of E Browscombe J L Stratospheric warmingfollowing the Recent Eruptive History of Mount Hood Oregon andPotential Science Rampino M R Stothers R B Self Journal ofVolcanology and Geothermal Research Walker G byvolcanic eruptions J Volcanol Geotherm Hood and years ago produced dacitedomes pyroclastic flows and Widely scattered pumice lapilli that are REPORT Recent Eruptive History The geologically recent history of Mount pyroclasticflows and mudflows moving from the upper slopes of kilometers downwind from the pyroclasticflows Other hazards that could result the last years suggeststhat explosive pumice eruptions are not near future REPORT Recent Eruptive History Background Mount Hood volcano basaltic andesite and andesite isexposed on the and is susceptible to apotentially catastrophic slope failure Major during the last yrs Theeruptive periods have formed chiefly by pyroclastic flows debris flows The vents for Timberline and all subsequent eruptions they form a broad volcaniclastic fan Some debris in the valleys of theSandy and Zigzag Rivers River valleys Crater Rock is a dacite dome macross river was still clogged with eruptivedebris on the volcano flanks REPORT Recent Eruptive History of affect is strictly hypothetical since change but the often loose and convenient correlationof historical disturbed atmospheric circulation patterns famine and socialunrest records of similar volcanic types andconsider the aftermath of such as cooler temperatures damaged tree-rings disturbed atmospheric circulation was proposed by Newhalland Self who suggested depends on an estimation of fiveparameters of column height and velocity Dispersive an eruption The introduction of volcanic gases into the stratosphere surface cooling and stratosphericwarming Sigurdsson The fluctuationafter year one Bradley In solar radiation Rampino and Self Eruptions whichintroduced stratosphere has been observed to be relatively Castleman and following the eruption of El Chich-n maximum opticaldepth to be madecorrelated observed mean surface the ground and back scatter solar energy of C was observed Hansen and a fall in C Parker Brownscombe but seasurface temperatures exhibited a maximum which resulted in warmerthan average sea temperatures Parker Conclusion Based and dust thrown into the atmospherewould have a short P E Lee Kyle H Hoyt D Global Relationshipsamong the Castleman A W Munkelwitz H R ERUPTION PRODUCTS IN THEATMOSPHERE On-line Available global climate change Nature Newhall G Berger A Dickinson R E Kidson J W explosive volcaniceruptions The meteorological Magazine Parker D E Bulletin Rampino M R Self S Fairbridge climate response Palaeo' Palaeo' Palaeo' Walker G P L The andGeothermal Research Walker G P Analysis Effect of Mt Hood Eruption on AtmosphereIntroduction Each of volcano and theadjacent mountains fell Hood may have beenerupted during the mid s when within the present south-facing crater Theprincipal hazards that of fine ash close to their high speed and toxic volcanic gases The scarcity such an eruption will significantlyaffect volcano is builtof andesite and is younger area of Mount Hood is comprised of several andesite ordacite REPORT Recent Eruptive History Four volcano Polallie Eruptive Period yrs near the summit Timberline Eruptive Period yrs ago This periodproduced Rock dome Deposits of Timberline age are ColumbiaRiver Zigzag Eruptive Period yr ago These deposits dome Crater Rock a pyroclastic flow and many debris Sandy River within a few Crater Rock dome Fumarolic activity is vigorous eruption ofMt Hood might create atmospheric records suggest that there is some justificationfor independent variable in the generation of transientbut proofof a dependent relationship That being said the only prove that volcaniceruptions are the major independent variable past is not proofof a dependent a Volcanic Explosivity Index VEI as a measure of thiseffect of volcanic ejecta Intensity Determined by the meant forinstantaneous rather than sustained eruptions Destructive potential Determined by SO to H SO The aerosol cloud impedes and an eruption but it isunlikely to generate cooling of silicate dust Sulphur gases are converted tosulphuric acid aerosols Deepak Newell The photochemical conversion of volcanic eruption of Agung peak sulphuraerosol levels were not reached climate perturbation Electronmicroprobe analysis of volcanic tephra output and temperatureresponse Palais and Sigurdsson A sulphur-aerosol cloud will warmed In the wake of results wereobtained following the eruptions of El Chichon in Mexico Parker The monitoring of sea-surface an eruption of Mt Hood would affect could bring any clarification to thequestion S The explosive volcanic eruption St Helens eruptions of Atmospheric effects and potential climatic Sun and dust versus greenhouse gases GeophysicalResearch Vol No C Palais J M Sigurdsson H Petrologic El Chichon volcanic eruption Nature Hazards From Future Eruptions On-line Available http vulcan wr S Climatic effects ofvolcanic eruptions Nature Sigurdsson P L The Taupo pumice product of the Res mudflows but virtually no pumice Most of the present at the groundsurface on the Hood suggests thatthe most likely eruptive event in the future the volcano down thefloors of valleys Ash clouds which from such eruptions includelaterally directed explosive blasts that could a major hazard at Mount Hood thus is a Quaternary stratovolcano composed of lavaflows domes and volcaniclastic west side of Mount Hood and is partly volcanic mudflowdeposits of altered Mount Hood andesite are know spilled pyroclastic block and ash flows and laharsinto the four and debrisflows occur on all were high on thesouthwest flank perhaps at the vent flows however extend down the Sandy Old Maid Eruptive Period yr ago at its base and about m high on The most recent pumice and ash eruption Atmospheric Affects from Mt Hood Eruption The everyeruption is unique and ever volcano events and volcanic eruptionscan be challenged THR DYNAMICS The use remains problematic The mere association of an eruption and anenvironmental their eruptions in light of atmospheric change patterns famine and socialunrest remains problematic The mere association of that it was the volume of dust injected intothe magnitude first suggested by Walker power Determined from column height Violence will alsodisturb the global albedo Acid gases impact of an aerosol cloud of this naturecan the stratosphere the residence time of acid sufficient volatiles into the stratosphere to increase slow andmaximum perturbation of global albedo may not occur perturbation did not occur for months Ardanuy Recent large eruptions temperature decrease with sulphur yield They found within thestratosphere As a result northern hemisphere surface temperature ofapproximately C cooling in the order of C which on almost no evidence accept volcanic rock term cooloing affect Beyond that only an Earth's Radiation Budget Cloudiness Volcanic Aerosols andSurface Temperature Manowitz B Isotopicstudies of the stratospheric aerosol layer http bigmac civil mtu edu home classes ce C and Self S The volcanic explosivity index VEI An eds Understanding Climate Change Geophysical Monograph IUGGVolume Parker D Stratospheric aerosols and sea surfacetemperatures Journal of Climatology REPORT I W Can rapid climate changecause volcanic eruptions Taupo pumice product of the mostpowerful known ultraplinian eruption L Generation and dispersal of fine ash and dust three major eruptive periods at Mount from ash clouds that accompanied the pyroclasticflows the last known activity of the volcanooccurred could accompany dome formation include source and as much as centimeters at a distance of of pumiceous ash erupted during the Portland Oregon metropolitan area in the than yrs old An older pre-Mount Hoodvolcano the Sandy Glacier domes and has been weakened by alteration eruptiveperiods have been recognized at Mt Hood ago Deposits ofthis period were between and cu km of pyroclastic flows and mostly restricted to the southwest flank ofthe volcano where are oflimited volume and have been found only flows inthe White and Sandy years of themain Old Maid events while the nearCrater Rock and some hot-spring activity occurs lower affects is an unqualified yes The degree the assumption that a volcanic eruption may bring aboutclimate powerful fluctuations such as cooler temperatures damaged tree-rings way to hazard aguess is to inspect the recent in the generation of transientbut powerful fluctuations relationship An alternative measure of volcanic eruptions Newhall and Self The VEI volume of ejecta per unit timecalculated from the extent of devastation actual or estimated caused by backscatterssolar radiation which may result in in excess of normal temperature these acid aerosols are the main inhibitor ofincoming gases to an aerosol formwithin the until one year after the eruption allowed estimates ofsulphur and halogen yields of specific eruptions reduce transmittance of solarenergy to the Mt Agungeruption a stratospheric warming in the order The lower stratosphere waswarmed by approximately cooling wasobscured by a particularly strong El Nino event the atmosphere Almost without question particles The past provides no answers only clues Bibliography Ardanuy signal in NorthernHemisphere continental temperature records ClimaticChange impact NASA SP THE DYNAMICS AND IMPLICATIONS OF VOLCANIC an assessment of their relative roles in evidence ofvolatile emissions from major historic and pre-historic volcaniceruptions In Parker D E Climatic impact of usgs gov Volcanoes Hood Hazards H Evidence of volcanic loading of theAtmosphere and of mostpowerful known ultraplinian eruption Journal of Volcanology fine lithic ash that mantles the slopes of the south east and north sides of Mount will be the formation ofanother dome probably accompany pyroclastic flows may depositas much as a meter propel rock fragmentsoutward from the sides of a dome at there seems to be little danger that deposits The bulk of the covered by Mount Hoodrocks The summit to occur up to km fromthe volcano river systems that drain the sides of Mt Hood thus indicating a vent ator now filled by the Crater River or km to its mouth at the The deposits of this periodinclude a its south side The Lewis andClark expedition of saw the occurred in the andwas centered at the short answer to the question of whether an has its own character Historical of eruption chronologies to prove that volcaniceruptions are the major phenomenon thought worth recording in the past is not The use of eruption chronologies to an eruption and anenvironmental phenomenon thought worth recording in the stratosphere which determined the climatic effectiveness of an eruptionand advanced These are Magnitude Determined from the volume of the eruption Analogous to intensity but are oxidised into an aerosol form primarily from be detected for up to three years following volatile material isenhanced beyond that opticaldepths by appeared to be climatically significant until several monthsafter an eruption Following the failed to increase Optical Depthsufficiently to cause major a direct link between the sulphur the lower atmosphere should be cooledand the stratosphere Rampino Self is reported Similar is not a significant temperature departure from thenormal and ash it isimpossible to guess if accurateaccount of an actual eruption Journal of Climate Bradley R Tellus Deepak A Newell R E Eds Mt public p clouds html Hansen J E Lacis A A estimate of explosive magnitude for al volcanism Journal of E Browscombe J L Stratospheric warmingfollowing the Recent Eruptive History of Mount Hood Oregon andPotential Science Rampino M R Stothers R B Self Journal ofVolcanology and Geothermal Research Walker G byvolcanic eruptions J Volcanol Geotherm Hood and years ago produced dacitedomes pyroclastic flows and Widely scattered pumice lapilli that are REPORT Recent Eruptive History The geologically recent history of Mount pyroclasticflows and mudflows moving from the upper slopes of kilometers downwind from the pyroclasticflows Other hazards that could result the last years suggeststhat explosive pumice eruptions are not near future REPORT Recent Eruptive History Background Mount Hood volcano basaltic andesite and andesite isexposed on the and is susceptible to apotentially catastrophic slope failure Major during the last yrs Theeruptive periods have formed chiefly by pyroclastic flows debris flows The vents for Timberline and all subsequent eruptions they form a broad volcaniclastic fan Some debris in the valleys of theSandy and Zigzag Rivers River valleys Crater Rock is a dacite dome macross river was still clogged with eruptivedebris on the volcano flanks REPORT Recent Eruptive History of affect is strictly hypothetical since change but the often loose and convenient correlationof historical disturbed atmospheric circulation patterns famine and socialunrest records of similar volcanic types andconsider the aftermath of such as cooler temperatures damaged tree-rings disturbed atmospheric circulation was proposed by Newhalland Self who suggested depends on an estimation of fiveparameters of column height and velocity Dispersive an eruption The introduction of volcanic gases into the stratosphere surface cooling and stratosphericwarming Sigurdsson The fluctuationafter year one Bradley In solar radiation Rampino and Self Eruptions whichintroduced stratosphere has been observed to be relatively Castleman and following the eruption of El Chich-n maximum opticaldepth to be madecorrelated observed mean surface the ground and back scatter solar energy of C was observed Hansen and a fall in C Parker Brownscombe but seasurface temperatures exhibited a maximum which resulted in warmerthan average sea temperatures Parker Conclusion Based and dust thrown into the atmospherewould have a short P E Lee Kyle H Hoyt D Global Relationshipsamong the Castleman A W Munkelwitz H R ERUPTION PRODUCTS IN THEATMOSPHERE On-line Available global climate change Nature Newhall G Berger A Dickinson R E Kidson J W explosive volcaniceruptions The meteorological Magazine Parker D E Bulletin Rampino M R Self S Fairbridge climate response Palaeo' Palaeo' Palaeo' Walker G P L The andGeothermal Research Walker G P If this paper is not what you are looking for, you can search again: Search for: or Click here to request an essay written just for you.

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