Continental Climate Flashcards
Describe
Moderate C: cold winter, hot summers
Greece
spring frost in north is Amyndeon
NZ
● Central Otago of NZ: sheltered from ocean influences by mountains Southern Alps on all sides is semi-continental
○ dry 360mm rainfall: irrigation necessary, reduced risks of fungal diseases - good conditions for organic/biodynamic
○ warm dry summers, long daylight hours, high UV levels: canopies carefully managed withgrapes shaded on west facing side to
protect from sunburn
○ most sites > 300m alt, shelter from maritime influence: high diurnal range to preserveacidity, delicate fruit/floral aromas
○ cold nights - spring frost: helicopters to mix colder and warmer bands of air to prevent frostdamage
○ gravel to clay, with schist as the parent rock, low in organic matter: compost and covercrops widely used to improve nutrient
levels and soil structure
● NZ: South Island - Marlborough
○ 2410 sunshine hours per year, cool continental, moderaely warm summers and mildwinters, protected from rains by mountain
ranges, 650mm rainfall, free draining alluviasoils - irrigation important and underground aquifers providing the main source ->grapes onvine well into autumn -> intensely flavored fruit with long dry growing season less fungaldisease pressure
Burgundy
○ Chablis - cool continental
■ uncertainty about ripening
■ vintage variations [Chard - early ripening being an advantage]
■ 670mm annual rainfall throughout the year -> high threat fungal diseases and difficulties leading to harvest (threat of rot)
■ region vulnerable to spring frosts and hail storms
○ Cote d’Or - moderate continental:
■ cold winter, warm summer, short summers make early ripening Chardonnay and Pinot Noir suitable varieties moderated by the protection of the Morvan hills to the west
700mm rainfall
■ Early autumn is typically dry, rain can be a threat at harvest
■ climate of the Mâconnais is typically slightly drier and hotter than Côte d’Or
Rhone
● Northern Rhone: moderate continental: cold winters, warm summers, adequate rainfall in autumn and wintercold Mistral wind from north:reduces fungal disease, vine vigor -> lower yields, higher concentrationin wines at lower production; better ripening in the southern part
○ Croze-Hermitatge:
■ north sector of AOC: steep slopes, continental climate with marked Alpine influences: extremelycold in winter, with
strong influence from Mistral, long growing season, high diurnal range,moderate sugar accumulation, retained acidity
■ southern sector: more temperate, heavy rainfall in late autumn and through winter, flattervineyards used to be dominated by orchards and farmsteads, soils deeper more
fertile than inHermitage thus lower concentration
Beaujolais
moderate continental: slightly warmer than rest of Burgundy adequate rainfall 740mm, Saone River as a moderator of extreme
temps, subjected to cold Mistral winds affecting flowering in cold damp spring weather -> damage leaves and grapes towards end of ripening when Gamay’s naturally thin skins most vulnerable <- vine orientation and training low to the ground important to reduce;
○ northern part hilly (Crus and Villages AOCs) at 200-500m with fast draining granite,schist, and sandy soils;
○ south and southeast facing slopes for max sun exposure -> harvest usu earlier thanBeaujolais AOC from flatter southern part where richer soils
Languedoc
○ Pic Saint-Loup AOC: more continental than elsewhere in Languedoc: cold winters, warm summers,high rain per year
rainfall: ~northern Rhone; Syrah does well here: min >= 50%; red/rose only
Alsace
cool to moderate, semi-continental
○ continental climate with cold winters and warm, sunny summer, Westerly winds carry rain clouds but much of the rain falls on the
western side of the Vosges Mountains -> 600mm rainfall (august, sep, oct -> issues at flowering and fruit set,less so harvest) - less
than half on the other side -> summer drought [irrigation is not permitted for AOC wines]
○ high sunshine hours, important to ripen grapes at this northerly latitude
○ drying influence is the Föhn wind - a warm wind that both raises the temperature andreduces the incidence of fungal diseases
○ marked diurnal temperature difference esp on higher sites -> retain acidity
Loire
● Central vineyards of Loire (except Nantais): cool continental ○ Touraine (continental, not as extreme as central vineyards) 700mm ○ Central vineyards: continenal high rainfall 750mm spring frosts, summer hailstorms; long growing season day lengths [vs Bordeaux, Marlborough] with low light intensity, low heat -> restrained flavors
Jura
○ continental, high rainfall at 1100mm per year during growing
season (exacerbated by heavy claysoil) -> threat to flowering and
fruit set -> reduce yield;
○ extra work to control weeds and combatfungal diseases; spring
frost; hail; vineyards on west-facing slopes;
○ altitude 250-400;
○ soils mainly clay and marl, limestone someplaces grassed
between rows to reduce erosion and limit herbicide use (such that
herbicides can belimited to the ground immediately below the
vines) mostly replacement-cane pruned at some height above the
ground to mitigate frost risk;
○ VSP to encourge air flow to reduce fungal diseases machine
harvest more popular except steep slopes
Canada
○ Ontario and inland British Columbia: extreme continental climate
-> most Canadian vineyards around planted near lakes which
moderate temperatures [Winter: the lake effect reduces the risk of
winter freeze. Spring: the waterheats up slowly delaying
budbreakusually until after the risk of spring frosts has passed
(though occasional frosts late in thespring cansometimes be an
issue). It then retains summer warmth into the autumn,extending
the growing season.]
○ Snow from moisture from lakes evaporating/meeting ambient cold
air -> protect vines and insulate from cold air, tho in coldest areas
eg Prince Edward County, winter freeze is aconcern
○ climate change -> unpredictable winters, sometimes minimal
protective snow cover
○ lakes: higher levels of humidity -> risk of fungal disease
○ drought a regular concern in inland regions of BC in rain shadow
of two mountain ranges,could be an issue in hotter drier years in
Ontario
○ 41-51N, northerly limit for viticulture: northerly lat esp in BC
makes for a shorter growingseason but compensated for by
longer daylight hours in summer than more southerly wineregions
eg US
○ Ontario: vineyards mainly planted on or near the shores of two of
the Great Lakes - Erie and Ontario
■ moderating the extreme continental climate, further away
from the lake would be too coldfor vinifera to survive
■ Soils: clay, sand, less of gravel and rocks, areas around the
lakes have a high concentrationof limestone
■ Niagara Peninsula
■ largest wine producing region in Ontario >= 80% of
vineyards
■ major influence from Lake Ontario and Niagara
Escarpment: (Ontario thedeepest of the Great Lakes
thus takes longer to cool down in autumn) aid
aircirculation; during winter land away from lake cools
quickly, cold air flowsdown slopes of escarpment,
warm air from lake rises and flows inland
thuswarming air flow in winter and cooling air flow in
summer -> prolong growingseason, reduce risks of
fungal disease and frosts
■ escarpment also protects from southwesterlu winds
■ on top of escarpment, climate more continental with
warm summer temp andcold winters
○ British Columbia: Okanagan Valley:
■ wide range of climates from cool northern end to hot desert
south, most soils are glacial deposit esp loams, increasingly
sandy in south thus irrigation essential
■ a chain of lakes moderate hot summer and cold winter
temp, most important the deep Okanagan Lake the northern
half of vineyard area much smaller than the Great Lakes in
Ontario thus smaller moderating effect
■ lakes also provide water for irrigation essential as annual
rainfall 300mm south400mm north tho dry conditions
reduces pest/disease pressure thus organicviticulture on the
rise
■ Extreme continental climate: cold winter not so cold to bury
vines, spring frost aconcern thus vineyards on mid-level
slopes to reduce risks
■ growing season short with long days, hot summers despite
lake effect
■ alt 300-600m cool nights and wide diurnal range
■ northern end of valley where east facing slopes shadede
from afternoon sunconditions more suited to cool climate
varietals eg PN, Chard, PG, Riesling,Gewurztraminer
■ hotter southern area better suited to black varieties
China
marked continental climates with very cold and arid winters
○ in most regions vines have to be buries as early as Nov to survive
low winter temp and aridconditions as vines underground retain
more water
○ heavy summer rains also affect most regions though in some total
rainfall small
○ very different climates bc vastness
○ Beijing, Heibei - coastal: humid continental warm humid summers
and cold winters with torrential rainin Aug-Sep, overall rainfall low
at 200-300mm per year, cool Pacific breezes moderate the warm
temp and reduce the humidity level
○ Shanzi and Shaanxi: Inland, central: dry continental, <500mm per
year, higher humidity in more southerly Shaanxi - more fungal
diseases
○ Ningxia: well inland, arid continental, climate ~200mm per year
with monsoon rains, very windy conditions, exacerbating dryness,
essential irrigation water drawn from Yellow River, best area
considered to be in the Helan Shan (Helan Mountains) where
mountains protectfrom the worst of the northwest desert winds
Argentina
○ combined influence of altitude and latitude: at low lat, altitude
ensures cool - vineyarads infoothills of Andes in west of country
except Patagonia, 500->1000m above sea level(highest ~3300m),
most vineyards on flat or gently sloped sites
○ key effects of altitude: wide diurnal temp range (>20C in many
places), cooler night time temp extends growing season and allow
grapes to retain acidity/aroma
○ combined effect of low lat and high alt results in intense sunlight,
a relatively high proportion of ultraviolet radiation due to high
altitude -> grapes with higher levels of tannins/anthocyanins
○ majority region: continental climate (tiny number of plantings in
coastal areas)
○ in the rain shadow of Andes -> rainfall very low some places
<200mm/year - desert-like ->irrigation essential; drier air reduces
disease risks
○ zonda blowing down from mountains along the valleys - HOT
DRY POWERFUL WINDin late spring and early summer -
lowering humidity, induce water stress in the vine, affectflowering,
fruit set, or grape damage if strong thus reduce crop <- trees as
windbreaks
○ Rain usu in summer, hail is constant threat, reducing yield in
some years <- netting(expensive), and many growers in Mendoza
own vineyards in different parts of province tomin risk of hail
damage
○ Frost significant problem in some areas of Mendoza usu flat or
bottom of slopes throughoutthe region regardless of alt affected
by El Nino phenomenon every 2-10 years: much higher rainfall,
hailstorms,damaging crop, increasing disease risks, reducing
harvests
○ alluvial soils deposited by rivers down from Andes
■ texture varies: larger stones with calcareous deposits
dominate higher alt closer to Andes;
■ middle areas dominated by gravel, sands, silts; lower areas:
deeper loamy-clay soils, richerin nutrients
■ bc dry continental climate: little organic matter from
decomposed flora and fauna -> poorsoils in higher alt,
optimal for naturally low yielding vines and high quality
viticulturewith increased investment, increased interest in
how texture/composition of soil affectswine
■ Deposits of calcareous soils in Gualtallary and Paraje
Altamira in the Uco Valley, the
■ Pedernal Valley in San Juan -> high quality wines
Portugal
■ mountain shields the Douro region from the worst of the
cooler, damper Atlanticweather -> warm continental - huge
range of microclimates
■ follows Douro river over 100km, start at Spanish
border, ends west of Mesao Frio(100km inland from
Oporto)
■ Douro Superior (Upper Douro east) hot and arid
450mm per annum
■ Cima Corgo (centre) warmer and drier 700mm per
annum
■ Baixo Corgo (west) [western limit marked by Serra do
Marao, 1415 m highest]: more
■ Atlantic influence, coolest wettest 900mm per annum
South Africa
○ Breede River Valley Region
■ warm dry region produces the most wine in SA at high
yields, high vol grapes for wine andspirits (distillation
industry), also some high quality estates
■ irrigation with water from Breede River
■ District: Breedekloof
■ upper Breede River, ample rainfall, irrigation not
needed - diff fromWorcester/Robertson
■ Winter/spring snows delay budburst and spring frost
damages buds
■ warm continental: long hang time, later harvest
■ cooling summer southeast winds moderate temp and
reduce fungal diseases