Quiz 3

Understanding Humidity and Dew Point

• Fundamental Relationship Between Temperature and Moisture:
    - Warmer air has the capacity to hold more moisture compared to colder air.
    - The Container Metaphor:
      - A large container represents air at a temperature of $90\,^\circ\text{F}$.
      - A smaller container represents air at a temperature of $65\,^\circ\text{F}$.
      - If both containers contain the same volume of water (representing a dew point of $65\,^\circ\text{F}$):
        - The $65\,^\circ\text{F}$ container is 100% full, resulting in a relative humidity of $100\%$.
        - The $90\,^\circ\text{F}$ container is far from full, resulting in a relative humidity of approximately $43\%$.

• Dew Point vs. Relative Humidity:
    - Relative Humidity: A measurement that changes based on air temperature.
    - Dew Point: A more stable measurement that does not change with temperature; it is a better indicator of how humid the air actually feels.
    - Example Scenarios:
      - Temperature $30\,^\circ\text{F}$ and Dew Point $30\,^\circ\text{F}$ = $100\%$ Relative Humidity.
      - Temperature $70\,^\circ\text{F}$ and Dew Point $30\,^\circ\text{F}$ = $23\%$ Relative Humidity.

• Heat Index Implications:
    - Scenario A: Temperature $70\,^\circ\text{F}$, Dew Point $70\,^\circ\text{F}$, Relative Humidity $100\%$, Heat Index $71$.
    - Scenario B: Temperature $90\,^\circ\text{F}$, Dew Point $70\,^\circ\text{F}$, Relative Humidity $52\%$, Heat Index $96$.

• General Comfort Thresholds:
    - Dew points in the $60\text{s}$ become noticeable.
    - Dew points in the $70\text{s}$ are considered oppressive.

The History of Meteorology and Cloud Naming

• Luke Howard (1802):
    - A pharmacist and amateur meteorologist who delivered a landmark lecture in London in December 1802.
    - Known for his obsession with weather and clouds since childhood, despite a lack of interest in school lessons (other than Latin).
    - Recognized that weather was difficult to study because it is elusive and cannot be physically sampled.

• The Insight of Basic Forms:
    - Howard realized that while clouds have endless shapes, they belong to few basic forms.
    - He used Latin nomenclature to bridge the gap between fixed categories and the constant transitions of the atmosphere.

• The Three Principal Cloud Types:
    - Cirrus: Latin for "tendril" or "hair."
    - Cumulus: Latin for "heap" or "pile."
    - Stratus: Latin for "layer" or "sheet."

• Naming Transitions and Hybrids:
    - Howard introduced intermediate types to account for change:
      - Cirrostratus: A high cirrus cloud descending and spreading into a sheet.
      - Stratocumulus: Fluffy cumulus clouds joining and spreading out.

• Cultural and Scientific Impact:
    - JW Von Goethe: The German poet/scientist wrote poems praising Howard.
    - Percy Shelley: Wrote "The Cloud," characterizing Howard's seven original types.
    - John Constable: Painted clouds on Hempstead Heath for two summers based on these classifications.

• Physical Reality of Clouds:
    - Clouds do not float; they fall slowly under the influence of gravity due to their weight. They stay aloft primarily through upward convection from sun-heated ground.
    - Nephrology: The formal study of clouds.

Fundamental Cloud Categories and Altitude Classification

• Role of Clouds in the Environment:
    - Crucial for distributing fresh water from oceans to land. Without them, agriculture and drinking water would be impossible.

• Main Classifications:
    - Cumulus: High-vertical growth, fluffy appearance. Formed low (< 2,000\,\text{m}) but can reach high altitudes.
    - Stratus: Flat sheets with few features. Reflect sunlight and cool the Earth. Can form as fog near the ground.
    - Cirrus: High-altitude ($7,000\text{--}14,000\,\text{m}$), comprised of ice crystals rather than water droplets. Often precede storms.

• Altitude Prefixes:
    - Alto (Tall/High): Mid-atmosphere clouds ($2,000\text{--}7,000\,\text{m}$).
      - Altocumulus: Cumulus at mid-altitudes.
      - Altostratus: Stratus at mid-altitudes.
      - (Note: There are no "Altocirrus" clouds because cirrus are already higher).
    - Cirro (Very High): Indicates clouds in the highest atmosphere level (> 7,000\,\text{m}).
      - Cirrocumulus: Small, high-altitude puffy clouds.
      - Cirrostratus: Thin, high-altitude sheets.

• Rain-Bearing Clouds (Nimbus):
    - Cumulonimbus: Giant thunderclouds spanning all three atmospheric layers. "Cloud Nine."
    - Nimbostratus: Flat, rain-producing sheets.

Comprehensive Guide to Cloud Species and Varieties

• Cirrus Species:
    - Cirrus vibratus: Long streaks or fibers.
    - Cirrus uncinus: Curly hooks.
    - Cirrus spissatus: Dense threads.
    - Cirrus floccus: Ice-based tufts of wool.
    - Cirrus castellanus: Tower-like formations.
    - Cirrus intortus: Twisted or knotted strands.

• Cirrocumulus Species:
    - Cirrocumulus stratiformis: Sheets of high puffy clouds.
    - Cirrocumulus lacunosus: Clouds perforated with circular holes.

• Cirrostratus Species:
    - Cirrostratus nebulosis: Thin, barely perceptible sheets; often create solar halos.

• Altocumulus Species:
    - Altocumulus lenticularis: Stationary, disk-shaped clouds formed by mountain eddies.

• Altostratus Varieties:
    - Altostratus undulatus: Wave-like rows.
    - Altostratus duplicatus: Two overlapping cloud layers.
    - Altostratus pannus: Ripped, chaotic fragments.
    - Altostratus translucidus: Thin enough to see the sun through.
    - Altostratus opacus: Thick enough to block the sun.
    - Altostratus radiatus: Parallel lines running toward the horizon.
    - Altostratus mammatus: Hanging, pouch-like structures named after mammary glands.

• Cumulus Growth Stages:
    - Cumulus humilis: Small, fair-weather cotton balls.
    - Cumulus mediocris: Height roughly equal to width.
    - Cumulus congestus: Taller than they are wide (significant vertical development).
    - Cumulus fractus: Tattered fragments ripped by wind.

• Cumulonimbus Evolution:
    - Cumulonimbus calvis: Puffy top (water droplets not yet frozen).
    - Cumulonimbus capillatus: Fibrous top (ice crystal formation).
    - Cumulonimbus incus: The final thunderstorm form, featuring an anvil-shaped top.

Exotic and Rare Atmospheric Phenomena

• Iridescent Clouds: Caused by specific sizes of water droplets scattering light at precise angles.

• Morning Glory Clouds: Extremely rare, satisfying rows of clouds unique to the Gulf Of Carpentaria, Australia.

• Kelvin-Helmholtz Waves: Wave-like curls formed when fluid layers of different densities slide and shear against each other.

• Asperitas (2017): A newly added rare type with waving, rolling undersides.

• Pileus Clouds: Cap clouds forming above rapidly growing clouds (like cumulonimbus or volcanic ash clouds).

Tropical Cyclones: Hurricanes, Typhoons, and Cyclones

• Formation Requirements:
    - Ocean temperatures of at least $80\,^\circ\text{F}$.
    - Sustained winds (often starting as African easterly waves across the Atlantic).
    - High evaporation rates acting as "fuel."

• Structure and Anatomy:
    - Eye: The center of low pressure, providing an eerie calm for $20\text{--}30\,\text{miles}$.
    - Eyewall: A ring of clouds around the eye with the highest wind speeds.
    - Rain bands: Curved cloud bands releasing torrential rain and potentially generating tornadoes.

• Metrics and Scale:
    - Classified as a hurricane once spinning winds reach $74\,\text{mph}$.
    - Categorized $1\text{--}5$ based on the Saffir-Simpson wind scale.
    - Physical size: Can reach $10\,\text{miles}$ high and $1,000\,\text{miles}$ across.

• Primary Danger: Storm Surge:
    - Winds push water toward the shore up to $20\,\text{feet}$ above sea level.
    - Significant impact can extend $100\,\text{miles}$ inland.
    - Responsible for $90\%$ of all hurricane-related fatalities.

• Climate Change Influence:
    - Physics dictates that warmer oceans increase maximum wind speed (potential intensity).
    - Historical data is inconsistent, but IPCC models suggest:
      - A slight decrease in the total number of tropical cyclones.
      - An increase in the frequency of Category 4 and 5 storms.
      - A significant global increase in hurricane-associated rainfall.

The Physics and Mechanics of Tornadoes

• Supercells: Towering thunderstorms over $50,000\,\text{feet}$ high that serve as the primary breeding ground for intense tornadoes.

• Formation Process:
    1. Updrafts: Formed by heat released during condensation.
    2. Mesocyclone: A wide, tall tube of spinning air created as air climbs and changes direction.
    3. Rear Flank Downdraft: Cool, dry air wrapping around the back of the mesocyclone.
    4. Temperature Gradient: High instability between the warm mesocyclone and cool downdraft.
    5. Tornado Genesis: The vortex tightens and connects the clouds to the ground.

• Classification and Statistics:
    - Supercell vs. Non-supercell: Non-supercell types include water spouts and land spouts.
    - Geography: The UK has the most tornadoes per land size (approx. $33$ per year). The US has the most overall (>1,000 per year).
    - Enhanced Fujita (EF) Scale:
      - EF0: $65\text{--}85\,\text{mph}$.
      - EF5: Wind speeds over $200\,\text{mph}$. Example: 2011 Joplin, Missouri tornado (>300\,\text{mph}, $36$ fatalities, $\$1,000,000,000$ damage).

Modern Aquaculture and Regenerative Ocean Farming

• Current State of Fisheries:
    - $33\%$ of wild fisheries are overfished; $60\%$ are at maximum capacity.
    - Over half of seafood consumed is grown via aquaculture.

• Standard Methods and Risks:
    - Offshore Net Pens: Overcrowded, high waste, antibiotic pollution, and danger of escapees weakening local genetics.
    - Coastal Ponds (Shrimp): High pollution and destruction of mangroves.
    - Land-based Recirculating Systems: Avoid coastal pollution but rely on fish meal ($10\%$ of global seafood catch goes to feed farmed fish).

• Regenerative Ocean Farming:
    - Focusing on shellfish and seaweed (low on the food chain).
    - Benefits: Carbon capture, improves water quality, provides habitat.
    - Output: $4,000\,\text{m}^2$ can produce $25\,\text{tons}$ of seaweed and $250,000\,\text{shellfish}$ in just $5\,\text{months}$.

Global Ocean Currents and the Conveyor Belt

• Drivers of Motion: Wind, tides, water density (temperature/salinity), and Earth's rotation (Coriolis effect).

• Categories:
    - Surface Currents (Top 10%): Wind-driven; form loops called Gyres (Clockwise in Northern Hemisphere, Counter-clockwise in Southern Hemisphere).
    - Deep Ocean Currents (90%): Driven by density changes.

• Thermohaline Circulation:
    - High salt concentration and cold temperatures make water more dense, causing it to sink.
    - This vertical movement powers the Global Conveyor Belt, the world's longest current.
    - It takes approximately $1,000\,\text{years}$ for a single drop of water to complete the loop.

The El Niño Southern Oscillation (ENSO)

• Normal Conditions: Trade winds blow East to West, piling warm water near Asia and causing upwelling of cold water near South America.

• El Niño Phase:
    - Trade winds weaken or reverse.
    - Warm water shifts East, changing rainfall patterns globally.
    - Results in Peru flooding and droughts in Indonesia, India, and Brazil.
    - Releases vast energy, often making El Niño years the warmest on record.

• La Niña Phase:
    - Strengthening of normal trade winds.
    - Increased cold water upwelling in the East.

Monsoons and Seasonal Wind Reversals

• Definition: A seasonal reversal of wind direction, not necessarily the rain itself.

• Wet Phase (Desert Southwest):
    - Summer heat over land creates low pressure; cooler ocean air flows toward it.
    - Moisture from the south (Mexico/Gulf) is drawn up into Arizona, New Mexico, and Utah.
    - High pressure to the east creates a clockwise flow that pulls moisture inland.

Questions & Discussion

• Question/Topic on Summer Patterns: Throughout much of the summer, there was an area of low pressure keeping the region cool and dry. How has that changed?

• Response: The ridge has shifted to the East, allowing the monsoonal pattern to pull moisture into the region, leading to more activity than seen earlier in the season.

• Safety Advisory: When encountering floodwaters during monsoonal rain, the recommendation is "turn around, don't drive through the water."

The Amazon’s Flying Rivers and Indigenous Conservation

• Transpiration Mechanics: Trees draw water through roots and release vapor through leaves. A fully grown Amazonian tree transpires $200\text{--}1,000\,\text{liters}$ per day.

• Flying Rivers: Visible as huge jets of humid moving air, carrying $20,000,000\,\text{tons}$ of water daily—surpassing the output of the Amazon River itself.

• Wampis Nation:
    - An autonomous community of $15,000$ people managing $130,000\,\text{km}^2$ of rainforest.
    - Philosophy: Sumac Kawsay (Living in harmony with nature).
    - Conservation efforts: Combating illegal gold mining (mercury pollution) and oil extraction to protect the forest's role as a carbon sink and fire barrier.
    - Their forest alone transpires over $34,000,000\,\text{liters}$ of water daily to support the regional water cycle.